diff --git a/src/main/java/cn/zhouyafeng/itchat4j/service/impl/LoginServiceImpl.java b/src/main/java/cn/zhouyafeng/itchat4j/service/impl/LoginServiceImpl.java
index ca77d19..5b47d25 100644
--- a/src/main/java/cn/zhouyafeng/itchat4j/service/impl/LoginServiceImpl.java
+++ b/src/main/java/cn/zhouyafeng/itchat4j/service/impl/LoginServiceImpl.java
@@ -77,7 +77,7 @@ public boolean login() {
 			// SleepUtils.sleep(time += 1000);
 			long millis = System.currentTimeMillis();
 			params.add(new BasicNameValuePair(LoginParaEnum.R.para(), String.valueOf(millis / 1579L)));
-			params.add(new BasicNameValuePair(LoginParaEnum._.para(), String.valueOf(millis)));
+			params.add(new BasicNameValuePair(LoginParaEnum.UNDERLINE.para(), String.valueOf(millis)));
 			HttpEntity entity = httpClient.doGet(URLEnum.LOGIN_URL.getUrl(), params, true, null);
 
 			try {
@@ -108,7 +108,7 @@ public String getUuid() {
 		params.add(new BasicNameValuePair(UUIDParaEnum.APP_ID.para(), UUIDParaEnum.APP_ID.value()));
 		params.add(new BasicNameValuePair(UUIDParaEnum.FUN.para(), UUIDParaEnum.FUN.value()));
 		params.add(new BasicNameValuePair(UUIDParaEnum.LANG.para(), UUIDParaEnum.LANG.value()));
-		params.add(new BasicNameValuePair(UUIDParaEnum._.para(), String.valueOf(System.currentTimeMillis())));
+		params.add(new BasicNameValuePair(UUIDParaEnum.UNDERLINE.para(), String.valueOf(System.currentTimeMillis())));
 
 		HttpEntity entity = httpClient.doGet(URLEnum.UUID_URL.getUrl(), params, true, null);
 
diff --git a/src/main/java/cn/zhouyafeng/itchat4j/utils/enums/parameters/LoginParaEnum.java b/src/main/java/cn/zhouyafeng/itchat4j/utils/enums/parameters/LoginParaEnum.java
index 0c0021a..69f0390 100644
--- a/src/main/java/cn/zhouyafeng/itchat4j/utils/enums/parameters/LoginParaEnum.java
+++ b/src/main/java/cn/zhouyafeng/itchat4j/utils/enums/parameters/LoginParaEnum.java
@@ -11,7 +11,7 @@ public enum LoginParaEnum {
     UUID("uuid", ""),
     TIP("tip", "0"),
     R("r", ""),
-    _("_", "");
+    UNDERLINE("_", "");
 
     private String para;
     private String value;
diff --git a/src/main/java/cn/zhouyafeng/itchat4j/utils/enums/parameters/UUIDParaEnum.java b/src/main/java/cn/zhouyafeng/itchat4j/utils/enums/parameters/UUIDParaEnum.java
index ef716e8..7c1717d 100644
--- a/src/main/java/cn/zhouyafeng/itchat4j/utils/enums/parameters/UUIDParaEnum.java
+++ b/src/main/java/cn/zhouyafeng/itchat4j/utils/enums/parameters/UUIDParaEnum.java
@@ -10,7 +10,7 @@ public enum UUIDParaEnum {
     APP_ID("appid", "wx782c26e4c19acffb"),
     FUN("fun", "new"),
     LANG("lang", "zh_CN"),
-    _("_", "时间戳");
+    UNDERLINE("_", "时间戳");
 
     private String para;
     private String value;