diff --git a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpOaCalendarService.java b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpOaCalendarService.java
new file mode 100644
index 000000000..8dc0d3136
--- /dev/null
+++ b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpOaCalendarService.java
@@ -0,0 +1,29 @@
+package me.chanjar.weixin.cp.api;
+
+import me.chanjar.weixin.common.error.WxErrorException;
+import me.chanjar.weixin.cp.bean.oa.calendar.WxCpOaCalendar;
+
+/**
+ * 企业微信日历接口.
+ *
+ * @author <a href="https://github.com/binarywang">Binary Wang</a>
+ * @date 2020-09-20
+ */
+public interface WxCpOaCalendarService {
+  /**
+   * 创建日历.
+   * <pre>
+   * 该接口用于通过应用在企业内创建一个日历。
+   * 注: 企业微信需要更新到3.0.2及以上版本
+   * 请求方式： POST（HTTPS）
+   * 请求地址： https://qyapi.weixin.qq.com/cgi-bin/oa/calendar/add?access_token=ACCESS_TOKEN
+   *
+   * 文档地址：https://work.weixin.qq.com/api/doc/90000/90135/92618
+   * </pre>
+   *
+   * @param calendar 日历对象
+   * @return 日历ID
+   * @throws WxErrorException .
+   */
+  String add(WxCpOaCalendar calendar) throws WxErrorException;
+}
diff --git a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpService.java b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpService.java
index 3378f8862..465090f19 100644
--- a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpService.java
+++ b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpService.java
@@ -388,7 +388,14 @@ public interface WxCpService {
    *
    * @return the oa service
    */
-  WxCpOaService getOAService();
+  WxCpOaService getOaService();
+
+  /**
+   * 获取日历相关接口的服务类对象
+   *
+   * @return the menu service
+   */
+  WxCpOaCalendarService getOaCalendarService();
 
   /**
    * 获取群机器人消息推送服务
@@ -445,4 +452,5 @@ public interface WxCpService {
    * @param tagService the tag service
    */
   void setTagService(WxCpTagService tagService);
+
 }
diff --git a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/impl/BaseWxCpServiceImpl.java b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/impl/BaseWxCpServiceImpl.java
index a04f46989..81c577eb9 100644
--- a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/impl/BaseWxCpServiceImpl.java
+++ b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/impl/BaseWxCpServiceImpl.java
@@ -52,6 +52,7 @@ public abstract class BaseWxCpServiceImpl<H, P> implements WxCpService, RequestH
   private WxCpExternalContactService externalContactService = new WxCpExternalContactServiceImpl(this);
   private WxCpGroupRobotService groupRobotService = new WxCpGroupRobotServiceImpl(this);
   private WxCpMessageService messageService = new WxCpMessageServiceImpl(this);
+  private WxCpOaCalendarService oaCalendarService = new WxCpOaCalendarServiceImpl(this);
 
   /**
    * 全局的是否正在刷新access token的锁.
@@ -305,7 +306,7 @@ public abstract class BaseWxCpServiceImpl<H, P> implements WxCpService, RequestH
       return null;
     } catch (IOException e) {
       log.error("\n【请求地址】: {}\n【请求参数】：{}\n【异常信息】：{}", uri, data, e.getMessage());
-      throw new WxErrorException(WxError.builder().errorMsg(e.getMessage()).errorCode(-1).build(),e);
+      throw new WxErrorException(WxError.builder().errorMsg(e.getMessage()).errorCode(-1).build(), e);
     }
   }
 
@@ -421,10 +422,15 @@ public abstract class BaseWxCpServiceImpl<H, P> implements WxCpService, RequestH
   }
 
   @Override
-  public WxCpOaService getOAService() {
+  public WxCpOaService getOaService() {
     return oaService;
   }
 
+  @Override
+  public WxCpOaCalendarService getOaCalendarService() {
+    return this.oaCalendarService;
+  }
+
   @Override
   public WxCpGroupRobotService getGroupRobotService() {
     return groupRobotService;
diff --git a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/impl/WxCpOaCalendarServiceImpl.java b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/impl/WxCpOaCalendarServiceImpl.java
new file mode 100644
index 000000000..c5b0a4aac
--- /dev/null
+++ b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/impl/WxCpOaCalendarServiceImpl.java
@@ -0,0 +1,25 @@
+package me.chanjar.weixin.cp.api.impl;
+
+import lombok.RequiredArgsConstructor;
+import me.chanjar.weixin.common.error.WxErrorException;
+import me.chanjar.weixin.cp.api.WxCpOaCalendarService;
+import me.chanjar.weixin.cp.api.WxCpService;
+import me.chanjar.weixin.cp.bean.oa.calendar.WxCpOaCalendar;
+
+import static me.chanjar.weixin.cp.constant.WxCpApiPathConsts.Oa.CALENDAR_ADD;
+
+/**
+ * .
+ *
+ * @author <a href="https://github.com/binarywang">Binary Wang</a>
+ * @date 2020-09-20
+ */
+@RequiredArgsConstructor
+public class WxCpOaCalendarServiceImpl implements WxCpOaCalendarService {
+  private final WxCpService wxCpService;
+
+  @Override
+  public String add(WxCpOaCalendar calendar) throws WxErrorException {
+    return this.wxCpService.post(this.wxCpService.getWxCpConfigStorage().getApiUrl(CALENDAR_ADD),calendar.toJson());
+  }
+}
diff --git a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/bean/message/WxCpXmlMessage.java b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/bean/message/WxCpXmlMessage.java
index a035f1d54..42f25add3 100644
--- a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/bean/message/WxCpXmlMessage.java
+++ b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/bean/message/WxCpXmlMessage.java
@@ -294,6 +294,20 @@ public class WxCpXmlMessage implements Serializable {
   @XStreamConverter(value = XStreamCDataConverter.class)
   private String address;
 
+  /**
+   * 日程ID.
+   */
+  @XStreamAlias("ScheduleId")
+  @XStreamConverter(value = XStreamCDataConverter.class)
+  private String scheduleId;
+
+  /**
+   * 日历ID.
+   */
+  @XStreamAlias("CalId")
+  @XStreamConverter(value = XStreamCDataConverter.class)
+  private String calId;
+
   /**
    * 扩展属性.
    */
diff --git a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/bean/oa/calendar/WxCpOaCalendar.java b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/bean/oa/calendar/WxCpOaCalendar.java
new file mode 100644
index 000000000..d4d9fd7f7
--- /dev/null
+++ b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/bean/oa/calendar/WxCpOaCalendar.java
@@ -0,0 +1,105 @@
+package me.chanjar.weixin.cp.bean.oa.calendar;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.gson.annotations.SerializedName;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.experimental.Accessors;
+import me.chanjar.weixin.cp.util.json.WxCpGsonBuilder;
+
+import java.io.Serializable;
+import java.util.List;
+
+/**
+ * 日历.
+ *
+ * @author <a href="https://github.com/binarywang">Binary Wang</a>
+ * @date 2020-09-20
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Accessors(chain = true)
+public class WxCpOaCalendar implements Serializable {
+  private static final long serialVersionUID = -817988838579546989L;
+
+  /**
+   * 变量名：organizer
+   * 是否必须：是
+   * 描述：指定的组织者userid。注意该字段指定后不可更新
+   */
+  @SerializedName("organizer")
+  private String organizer;
+
+  /**
+   * 变量名：readonly
+   * 是否必须：否
+   * 描述：日历组织者对日历是否只读权限（即不可编辑日历，不可在日历上添加日程，仅可作为组织者删除日历）。0-否；1-是。默认为1，即只读
+   */
+  @SerializedName("readonly")
+  private Integer readonly;
+
+  /**
+   * 变量名：set_as_default
+   * 是否必须：否
+   * 描述：是否将该日历设置为组织者的默认日历。0-否；1-是。默认为0，即不设为默认日历
+   */
+  @SerializedName("set_as_default")
+  private Integer setAsDefault;
+
+  /**
+   * 变量名：summary
+   * 是否必须：是
+   * 描述：日历标题。1 ~ 128 字符
+   */
+  @SerializedName("summary")
+  private String summary;
+
+  /**
+   * 变量名：color
+   * 是否必须：是
+   * 描述：日历在终端上显示的颜色，RGB颜色编码16进制表示，例如：”#0000FF” 表示纯蓝色
+   */
+  @SerializedName("color")
+  private String color;
+
+  /**
+   * 变量名：description
+   * 是否必须：否
+   * 描述：日历描述。0 ~ 512 字符
+   */
+  @SerializedName("description")
+  private String description;
+
+  /**
+   * 变量名：shares
+   * 是否必须：否
+   * 描述：日历共享成员列表。最多2000人
+   */
+  @SerializedName("shares")
+  private List<ShareInfo> shares;
+
+  @Data
+  @AllArgsConstructor
+  public static class ShareInfo implements Serializable {
+    private static final long serialVersionUID = -4882781114860754679L;
+
+    /**
+     * 日历共享成员的id
+     */
+    private String userid;
+
+    /**
+     * 共享成员对日历是否只读权限（即不可编辑日历，不可在日历上添加日程，仅可以退出日历）。
+     * 0-否；1-是。默认为1，即只读
+     */
+    private Integer readonly;
+  }
+
+  public String toJson() {
+    return WxCpGsonBuilder.create().toJson(ImmutableMap.of("calendar",this));
+  }
+}
diff --git a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/constant/WxCpApiPathConsts.java b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/constant/WxCpApiPathConsts.java
index 6e5e52a14..66132553b 100644
--- a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/constant/WxCpApiPathConsts.java
+++ b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/constant/WxCpApiPathConsts.java
@@ -101,6 +101,11 @@ public final class WxCpApiPathConsts {
     public static final String GET_DIAL_RECORD = "/cgi-bin/dial/get_dial_record";
     public static final String GET_TEMPLATE_DETAIL = "/cgi-bin/oa/gettemplatedetail";
     public static final String APPLY_EVENT = "/cgi-bin/oa/applyevent";
+
+    public static final String CALENDAR_ADD = "/cgi-bin/oa/calendar/add";
+    public static final String CALENDAR_UPDATE = "/cgi-bin/oa/calendar/update";
+    public static final String CALENDAR_GET = "/cgi-bin/oa/calendar/get";
+    public static final String CALENDAR_DEL = "/cgi-bin/oa/calendar/del";
   }
 
   @UtilityClass
diff --git a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/constant/WxCpConsts.java b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/constant/WxCpConsts.java
index 98bfd90ba..6e8fbb468 100644
--- a/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/constant/WxCpConsts.java
+++ b/weixin-java-cp/src/main/java/me/chanjar/weixin/cp/constant/WxCpConsts.java
@@ -103,6 +103,30 @@ public class WxCpConsts {
      */
     public static final String OPEN_APPROVAL_CHANGE = "open_approval_change";
 
+    /**
+     * 修改日历事件
+     */
+    public static final String MODIFY_CALENDAR = "modify_calendar";
+
+    /**
+     * 删除日历事件
+     */
+    public static final String DELETE_CALENDAR = "delete_calendar";
+
+    /**
+     * 添加日程事件
+     */
+    public static final String ADD_SCHEDULE = "add_schedule";
+
+    /**
+     * 修改日程事件
+     */
+    public static final String MODIFY_SCHEDULE = "modify_schedule";
+
+    /**
+     * 删除日程事件
+     */
+    public static final String DELETE_SCHEDULE = "delete_schedule";
 
   }
 
diff --git a/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/api/impl/WxCpOaCalendarServiceImplTest.java b/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/api/impl/WxCpOaCalendarServiceImplTest.java
new file mode 100644
index 000000000..905dc4995
--- /dev/null
+++ b/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/api/impl/WxCpOaCalendarServiceImplTest.java
@@ -0,0 +1,39 @@
+package me.chanjar.weixin.cp.api.impl;
+
+import com.google.inject.Inject;
+import me.chanjar.weixin.common.error.WxErrorException;
+import me.chanjar.weixin.cp.api.ApiTestModule;
+import me.chanjar.weixin.cp.api.WxCpService;
+import me.chanjar.weixin.cp.bean.oa.calendar.WxCpOaCalendar;
+import org.testng.annotations.Guice;
+import org.testng.annotations.Test;
+
+import java.util.Arrays;
+
+/**
+ * 单元测试.
+ *
+ * @author <a href="https://github.com/binarywang">Binary Wang</a>
+ * @date 2020-09-20
+ */
+
+@Test
+@Guice(modules = ApiTestModule.class)
+public class WxCpOaCalendarServiceImplTest {
+  @Inject
+  protected WxCpService wxService;
+
+  @Test
+  public void testAdd() throws WxErrorException {
+    this.wxService.getOaCalendarService().add(WxCpOaCalendar.builder()
+      .organizer("userid1")
+      .readonly(1)
+      .setAsDefault(1)
+      .summary("test_summary")
+      .color("#FF3030")
+      .description("test_describe")
+      .shares(Arrays.asList(new WxCpOaCalendar.ShareInfo("userid2", null),
+        new WxCpOaCalendar.ShareInfo("userid3", 1)))
+      .build());
+  }
+}
diff --git a/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/api/impl/WxCpOaServiceImplTest.java b/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/api/impl/WxCpOaServiceImplTest.java
index 6f3a76b0a..758f77970 100644
--- a/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/api/impl/WxCpOaServiceImplTest.java
+++ b/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/api/impl/WxCpOaServiceImplTest.java
@@ -37,7 +37,7 @@ public class WxCpOaServiceImplTest {
     Date startTime = DateFormatUtils.ISO_8601_EXTENDED_DATE_FORMAT.parse("2019-04-11");
     Date endTime = DateFormatUtils.ISO_8601_EXTENDED_DATE_FORMAT.parse("2019-05-10");
 
-    List<WxCpCheckinData> results = wxService.getOAService()
+    List<WxCpCheckinData> results = wxService.getOaService()
       .getCheckinData(1, startTime, endTime, Lists.newArrayList("binary"));
 
     assertThat(results).isNotNull();
@@ -51,7 +51,7 @@ public class WxCpOaServiceImplTest {
   public void testGetCheckinOption() throws WxErrorException {
 
     Date now = new Date();
-    List<WxCpCheckinOption> results = wxService.getOAService().getCheckinOption(now, Lists.newArrayList("binary"));
+    List<WxCpCheckinOption> results = wxService.getOaService().getCheckinOption(now, Lists.newArrayList("binary"));
     assertThat(results).isNotNull();
     System.out.println("results ");
     System.out.println(gson.toJson(results));
@@ -61,7 +61,7 @@ public class WxCpOaServiceImplTest {
   public void testGetApprovalInfo() throws WxErrorException, ParseException {
     Date startTime = DateFormatUtils.ISO_8601_EXTENDED_DATE_FORMAT.parse("2019-12-01");
     Date endTime = DateFormatUtils.ISO_8601_EXTENDED_DATE_FORMAT.parse("2019-12-31");
-    WxCpApprovalInfo result = wxService.getOAService().getApprovalInfo(startTime, endTime);
+    WxCpApprovalInfo result = wxService.getOaService().getApprovalInfo(startTime, endTime);
 
     assertThat(result).isNotNull();
 
@@ -72,7 +72,7 @@ public class WxCpOaServiceImplTest {
   @Test
   public void testGetApprovalDetail() throws WxErrorException {
     String spNo = "201912020001";
-    WxCpApprovalDetailResult result = wxService.getOAService().getApprovalDetail(spNo);
+    WxCpApprovalDetailResult result = wxService.getOaService().getApprovalDetail(spNo);
 
     assertThat(result).isNotNull();
 
@@ -83,7 +83,7 @@ public class WxCpOaServiceImplTest {
   @Test
   public void testGetTemplateDetail() throws WxErrorException {
     String templateId = "3TkZjxugodbqpEMk9j7X6h6zKqYkc7MxQrrFmT7H";
-    WxCpTemplateResult result = wxService.getOAService().getTemplateDetail(templateId);
+    WxCpTemplateResult result = wxService.getOaService().getTemplateDetail(templateId);
     assertThat(result).isNotNull();
     System.out.println("result ");
     System.out.println(gson.toJson(result));
@@ -91,7 +91,7 @@ public class WxCpOaServiceImplTest {
 
   @Test
   public void testApply() throws WxErrorException {
-    this.wxService.getOAService().apply(new WxCpOaApplyEventRequest().setCreatorUserId("123"));
+    this.wxService.getOaService().apply(new WxCpOaApplyEventRequest().setCreatorUserId("123"));
   }
 
   @Test
diff --git a/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/bean/oa/calendar/WxCpOaCalendarTest.java b/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/bean/oa/calendar/WxCpOaCalendarTest.java
new file mode 100644
index 000000000..761b0f8f9
--- /dev/null
+++ b/weixin-java-cp/src/test/java/me/chanjar/weixin/cp/bean/oa/calendar/WxCpOaCalendarTest.java
@@ -0,0 +1,52 @@
+package me.chanjar.weixin.cp.bean.oa.calendar;
+
+import me.chanjar.weixin.common.util.json.GsonParser;
+import org.testng.annotations.Test;
+
+import java.util.Arrays;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * 单元测试.
+ *
+ * @author <a href="https://github.com/binarywang">Binary Wang</a>
+ * @date 2020-09-20
+ */
+public class WxCpOaCalendarTest {
+
+  @Test
+  public void testToJson() {
+    String json = "{\n" +
+      "    \"calendar\" : {\n" +
+      "        \"organizer\" : \"userid1\",\n" +
+      "        \"readonly\" : 1,\n" +
+      "        \"set_as_default\" : 1,\n" +
+      "        \"summary\" : \"test_summary\",\n" +
+      "        \"color\" : \"#FF3030\",\n" +
+      "        \"description\" : \"test_describe\",\n" +
+      "        \"shares\" : [\n" +
+      "            {\n" +
+      "                \"userid\" : \"userid2\"\n" +
+      "            },\n" +
+      "            {\n" +
+      "                \"userid\" : \"userid3\",\n" +
+      "                \"readonly\" : 1\n" +
+      "            }\n" +
+      "        ]\n" +
+      "    }\n" +
+      "}\n";
+
+    assertThat(WxCpOaCalendar.builder()
+      .organizer("userid1")
+      .readonly(1)
+      .setAsDefault(1)
+      .summary("test_summary")
+      .color("#FF3030")
+      .description("test_describe")
+      .shares(Arrays.asList(new WxCpOaCalendar.ShareInfo("userid2", null),
+        new WxCpOaCalendar.ShareInfo("userid3", 1)))
+      .build().toJson())
+      .isEqualTo(GsonParser.parse(json).toString());
+  }
+}