diff --git a/Doc/README.md b/Doc/README.md
index 9a02a1d..63c6bfd 100644
--- a/Doc/README.md
+++ b/Doc/README.md
@@ -11,3 +11,9 @@
 * [sign_up](api/sign_up.md)
 * [is_account_existed](api/is_account_existed.md)
 * [get_user_info](api/get_user_info.md)
+
+
+## Error
+
+* [error info format](api/error_info_format.md)
+* [error info list](api/error_info_list.md)
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diff --git a/Doc/api/error_info_format.md b/Doc/api/error_info_format.md
new file mode 100644
index 0000000..03047fb
--- /dev/null
+++ b/Doc/api/error_info_format.md
@@ -0,0 +1,23 @@
+# error info format
+
+* **error**: error info
+	* **code**: main error id
+	* **desc**: main error description
+	* **sub_error**: sub error info
+		* **code**: sub error id
+		* **desc**: sub error description
+	
+
+
+```
+{
+  "error": {
+    "desc": "auth fail",
+    "sub_error": {
+      "desc": "auth token invalid",
+      "code": 1001
+    },
+    "code": 1
+  }
+}
+```
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diff --git a/Doc/api/error_info_list.md b/Doc/api/error_info_list.md
new file mode 100644
index 0000000..11aff59
--- /dev/null
+++ b/Doc/api/error_info_list.md
@@ -0,0 +1,43 @@
+# error info list
+
+```
+{
+	"errors": [
+        {
+            "code": 1,
+            "desc": "auth fail"
+        },
+        {
+            "code": 4,
+            "desc": "request rejected"
+        },
+        {
+            "code": 5,
+            "zh-cn": "internal error"
+        }
+    ],
+    
+    "sub_errors": [
+        {
+            "code": 1001,
+            "desc": "auth token invalid"
+        },
+        {
+            "code": 4001,
+            "desc": "param error"
+        },
+        {
+            "code": 4002,
+            "desc": "account no existed"
+        },
+        {
+            "code": 4004,
+            "desc": "account or password error"
+        },
+        {
+            "code": 5001,
+            "desc": "internal database error"
+        }
+    ]
+}
+```
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