diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WXBizDataCrypt.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WXBizDataCrypt.java
index 6c2ffe7d..361461a9 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WXBizDataCrypt.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WXBizDataCrypt.java
@@ -8,7 +8,7 @@ import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.JSONObject;
 
 /**
- * 对微信小程序用户加密数据的解密.
+ * 对微信小程序用户加密数据的解密。
  *
  * @since 1.8
  * @see <a href="https://developers.weixin.qq.com/miniprogram/dev/api/signature.html#wxchecksessionobject">加密数据解密算法</a>
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WeixinProxy.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WeixinProxy.java
index df9fc2fd..d86f10e0 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WeixinProxy.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WeixinProxy.java
@@ -13,6 +13,8 @@ import com.foxinmy.weixin4j.wxa.api.TemplateApi;
 import com.foxinmy.weixin4j.wxa.api.TemplateMessageApi;
 
 /**
+ * The facade of WXA APIs.
+ *
  * @since 1.8
  */
 public class WeixinProxy {
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/LoginApi.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/LoginApi.java
index 1a664931..ddb5500a 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/LoginApi.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/LoginApi.java
@@ -7,6 +7,8 @@ import com.foxinmy.weixin4j.model.WeixinAccount;
 import com.foxinmy.weixin4j.wxa.model.Session;
 
 /**
+ * 登录凭证校验。
+ *
  * @since 1.8
  */
 public class LoginApi extends WxaApi {
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/QrCodeApi.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/QrCodeApi.java
index bd87e0aa..85540a1a 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/QrCodeApi.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/QrCodeApi.java
@@ -9,7 +9,7 @@ import com.foxinmy.weixin4j.http.weixin.WeixinResponse;
 import com.foxinmy.weixin4j.token.TokenManager;
 
 /**
- * 获取二维码.
+ * 获取二维码。
  *
  * <p>
  *   通过后台接口可以获取小程序任意页面的二维码，扫描该二维码可以直接进入小程序对应的页面。
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/TemplateApi.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/TemplateApi.java
index a4bbc910..e1bd0fac 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/TemplateApi.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/TemplateApi.java
@@ -11,7 +11,7 @@ import com.foxinmy.weixin4j.token.TokenManager;
 import com.foxinmy.weixin4j.wxa.model.template.Template;
 
 /**
- * 模版消息管理
+ * 模版消息管理。
  *
  * @see <a href="https://developers.weixin.qq.com/miniprogram/dev/api/notice.html#%E6%A8%A1%E7%89%88%E6%B6%88%E6%81%AF%E7%AE%A1%E7%90%86">模版消息管理</a>
  * @since 1.8
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/TemplateMessageApi.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/TemplateMessageApi.java
index ebc85901..3424e529 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/TemplateMessageApi.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/TemplateMessageApi.java
@@ -6,7 +6,7 @@ import com.foxinmy.weixin4j.exception.WeixinException;
 import com.foxinmy.weixin4j.token.TokenManager;
 
 /**
- * 发送模版消息
+ * 发送模版消息。
  *
  * @see <a href="https://developers.weixin.qq.com/miniprogram/dev/api/notice.html#%E5%8F%91%E9%80%81%E6%A8%A1%E7%89%88%E6%B6%88%E6%81%AF">发送模版消息</a>
  * @since 1.8
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/package-info.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/package-info.java
index 4033640a..552586c2 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/package-info.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/package-info.java
@@ -1,4 +1,6 @@
 /**
+ * APIs.
+ *
  * @since 1.8
  */
 package com.foxinmy.weixin4j.wxa.api;
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/Session.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/Session.java
index 679c7918..d35e76db 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/Session.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/Session.java
@@ -2,7 +2,11 @@ package com.foxinmy.weixin4j.wxa.model;
 
 import java.io.Serializable;
 
+import com.foxinmy.weixin4j.wxa.WXBizDataCrypt;
+
 /**
+ * 登录会话。
+ *
  * @since 1.8
  */
 public class Session implements Serializable {
@@ -21,6 +25,17 @@ public class Session implements Serializable {
 		this.openId = openId;
 	}
 
+	/**
+	 * 返回会话密钥
+	 * <p>注意：会话密钥 session_key 是对用户数据进行
+	 * <a href="https://developers.weixin.qq.com/miniprogram/dev/api/signature.html#wxchecksessionobject">加密签名</a>
+	 * 的密钥。
+	 * 为了应用自身的数据安全，开发者服务器不应该把会话密钥下发到小程序，
+	 * 也不应该对外提供这个密钥。</p>
+	 *
+	 * @return 会话密钥
+	 * @see WXBizDataCrypt
+	 */
 	public String getSessionKey() {
 		return sessionKey;
 	}
@@ -29,6 +44,15 @@ public class Session implements Serializable {
 		this.sessionKey = sessionKey;
 	}
 
+	/**
+	 * 返回UnionID
+	 * <p>
+	 * UnionID 只在满足一定条件的情况下返回。
+	 * 具体参看 <a href="https://developers.weixin.qq.com/miniprogram/dev/api/unionID.html">UnionID机制说明</a>。
+	 * </p>
+	 *
+	 * @return UnionID
+	 */
 	public String getUnionId() {
 		return unionId;
 	}
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/package-info.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/package-info.java
index e12e627b..f34f12bf 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/package-info.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/package-info.java
@@ -1,4 +1,6 @@
 /**
+ * Models.
+ *
  * @since 1.8
  */
 package com.foxinmy.weixin4j.wxa.model;
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/Keyword.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/Keyword.java
index e1526400..b4ed513a 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/Keyword.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/Keyword.java
@@ -4,6 +4,11 @@ import java.io.Serializable;
 
 import com.alibaba.fastjson.annotation.JSONField;
 
+/**
+ * 模板消息的模板里的关键词。
+ *
+ * @since 1.8
+ */
 public class Keyword implements Serializable {
 
 	private static final long serialVersionUID = 2018052601L;
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/Template.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/Template.java
index d349abc2..f38f53ec 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/Template.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/Template.java
@@ -5,6 +5,11 @@ import java.util.List;
 
 import com.alibaba.fastjson.annotation.JSONField;
 
+/**
+ * 模板消息的模板。
+ *
+ * @since 1.8
+ */
 public class Template implements Serializable {
 
 	private static final long serialVersionUID = 2018052601L;
diff --git a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/package-info.java b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/package-info.java
index f44be914..ff95918c 100644
--- a/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/package-info.java
+++ b/weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/template/package-info.java
@@ -1,4 +1,6 @@
 /**
  * Models for {@link com.foxinmy.weixin4j.wxa.api.TemplateApi}.
+ *
+ * @since 1.8
  */
 package com.foxinmy.weixin4j.wxa.model.template;