diff --git a/.gitignore b/.gitignore
index 11f25e50..901e06b8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -329,5 +329,5 @@ ASALocalRun/
 # MFractors (Xamarin productivity tool) working folder 
 .mfractor/
 
-!Common/Log/
+!Common/Common/Log/
 Doc/
\ No newline at end of file
diff --git a/Common/Common/Log/LCLogLevel.cs b/Common/Common/Log/LCLogLevel.cs
new file mode 100644
index 00000000..f43aaf58
--- /dev/null
+++ b/Common/Common/Log/LCLogLevel.cs
@@ -0,0 +1,19 @@
+namespace LeanCloud {
+    /// <summary>
+    /// 日志级别
+    /// </summary>
+    public enum LCLogLevel {
+        /// <summary>
+        /// 调试级别
+        /// </summary>
+        Debug,
+        /// <summary>
+        /// 警告级别
+        /// </summary>
+        Warn,
+        /// <summary>
+        /// 错误级别
+        /// </summary>
+        Error,
+    }
+}
diff --git a/Common/Common/Log/LCLogger.cs b/Common/Common/Log/LCLogger.cs
new file mode 100644
index 00000000..1ffbcac4
--- /dev/null
+++ b/Common/Common/Log/LCLogger.cs
@@ -0,0 +1,51 @@
+using System;
+using System.Text;
+
+namespace LeanCloud {
+    /// <summary>
+    /// 日志类
+    /// </summary>
+    public static class LCLogger {
+        /// <summary>
+        /// 日志回调接口，方便开发者调试
+        /// </summary>
+        /// <value>The log delegate.</value>
+        public static Action<LCLogLevel, string> LogDelegate {
+            get; set;
+        }
+
+        public static void Debug(string log) {
+            LogDelegate?.Invoke(LCLogLevel.Debug, log);
+        }
+
+        public static void Debug(string format, params object[] args) {
+            LogDelegate?.Invoke(LCLogLevel.Debug, string.Format(format, args));
+        }
+
+        public static void Warn(string log) {
+            LogDelegate?.Invoke(LCLogLevel.Warn, log);
+        }
+
+        public static void Warn(string format, params object[] args) {
+            LogDelegate?.Invoke(LCLogLevel.Warn, string.Format(format, args));
+        }
+
+        public static void Error(string log) {
+            LogDelegate?.Invoke(LCLogLevel.Error, log);
+        }
+
+        public static void Error(string format, params object[] args) {
+            LogDelegate?.Invoke(LCLogLevel.Error, string.Format(format, args));
+        }
+
+        public static void Error(Exception e) {
+            StringBuilder sb = new StringBuilder();
+            sb.Append(e.GetType());
+            sb.Append("\n");
+            sb.Append(e.Message);
+            sb.Append("\n");
+            sb.Append(e.StackTrace);
+            Error(sb.ToString());
+        }
+    }
+}