diff --git a/ServerDocument.md b/ServerDocument.md
index dee4919..95a6af6 100644
--- a/ServerDocument.md
+++ b/ServerDocument.md
@@ -46,32 +46,27 @@
 
 	/**
 	 * 签名算法
-	 * @param userOrder
-	 * @param key
+	 * @param request
 	 * @return
 	 */
-	private String sig(UserOrder userOrder, String key) {
-
+	public String sig(HttpServletRequest request){
+		
+		Enumeration names = request.getParameterNames();
 		SortedSet<String> allParams = Sets.newTreeSet();
-		try {
-			
-			allParams.add(Constants.Keys.ORDER_ID + "=" + URLEncoder.encode(userOrder.getId()+"", "utf-8"));
-			allParams.add(Constants.Keys.APPID + "=" + URLEncoder.encode(userOrder.getAppId()+"", "utf-8"));
-			allParams.add(Constants.Keys.USER_ID + "=" + URLEncoder.encode(userOrder.getUserId()+"", "utf-8"));
-			allParams.add(Constants.Keys.PRODUCT + "=" + URLEncoder.encode(userOrder.getProduct(), "utf-8"));
-			
-			allParams.add(Constants.Keys.EXTRA_INFO + "=" + URLEncoder.encode(userOrder.getExtraInfo(), "utf-8"));
-			allParams.add(Constants.Keys.CURRENCY + "=" + URLEncoder.encode(userOrder.getCurrency(), "utf-8"));
-			allParams.add(Constants.Keys.AMOUNT + "=" + URLEncoder.encode(userOrder.getAmount()+"", "utf-8"));
-			allParams.add(Constants.Keys.REAL_AMOUNT + "=" + URLEncoder.encode(userOrder.getRealAmount()+"", "utf-8"));
-			
-		} catch (UnsupportedEncodingException e) {
-			e.printStackTrace();
+		 
+		while (names.hasMoreElements()) {
+		    String name = (String) names.nextElement();
+		    if (name.equals("sig")) {
+		        continue;
+		    }
+		 
+		    try {
+				allParams.add(name + "=" + UriUtils.decode(request.getParameter(name), "utf-8"));
+			} catch (UnsupportedEncodingException e) {
+				e.printStackTrace();
+			}
 		}
-		
-		String params = Joiner.on("&").join(allParams) + key;
-		log.info("sig:" + params);
-		String computedToken = DigestUtils.md5DigestAsHex(params.getBytes());
+		String computedToken = DigestUtils.md5DigestAsHex(Joiner.on("&").join(allParams).getBytes());
 		return computedToken;
 	}
 ```