diff --git a/LuaProfiler/LuaProfilerClient/Core/Driver/LuaProfiler.cs b/LuaProfiler/LuaProfilerClient/Core/Driver/LuaProfiler.cs
index f5799def..b127a835 100644
--- a/LuaProfiler/LuaProfilerClient/Core/Driver/LuaProfiler.cs
+++ b/LuaProfiler/LuaProfilerClient/Core/Driver/LuaProfiler.cs
@@ -123,7 +123,9 @@ public static void BeginSample(IntPtr luaState, string name)
                 long memoryCount = LuaLib.GetLuaMemory(luaState);
                 Sample sample = Sample.Create(getcurrentTime, (int)memoryCount, name);
                 beginSampleMemoryStack.Push(sample);
+            #if UNITY_5_5_OR_NEWER
                 Profiler.BeginSample(name);
+            #endif
             }
             catch
             {
@@ -214,7 +216,9 @@ public static void EndSample(IntPtr luaState)
             {
                 byte[] luagc = new byte[Math.Max(0, selfLuaGC - 32)];
             }
+        #if UNITY_5_5_OR_NEWER
             Profiler.EndSample();
+        #endif
 
             if (!sample.CheckSampleValid())
             {
diff --git a/LuaProfiler/LuaProfilerClient/Core/Setting/LuaDeepProfilerAssetSetting.cs b/LuaProfiler/LuaProfilerClient/Core/Setting/LuaDeepProfilerAssetSetting.cs
index c89ef495..f87c69d8 100644
--- a/LuaProfiler/LuaProfilerClient/Core/Setting/LuaDeepProfilerAssetSetting.cs
+++ b/LuaProfiler/LuaProfilerClient/Core/Setting/LuaDeepProfilerAssetSetting.cs
@@ -18,7 +18,12 @@ public static LuaDeepProfilerAssetSetting Instance
             {
                 if (instance == null)
                 {
+                #if (UNITY_5 || UNITY_2017_1_OR_NEWER)
                     instance = AssetDatabase.LoadAssetAtPath<LuaDeepProfilerAssetSetting>("Assets/LuaDeepProfilerAssetSetting.asset");
+                #else
+                    instance = AssetDatabase.LoadAssetAtPath("Assets/LuaDeepProfilerAssetSetting.asset", typeof(LuaDeepProfilerAssetSetting)) as LuaDeepProfilerAssetSetting;
+                #endif
+
                     if (instance == null)
                     {
                         UnityEngine.Debug.Log("Lua Profiler: cannot find integration settings, creating default settings");
diff --git a/LuaProfiler/LuaProfilerClient/Editor/StartUp.cs b/LuaProfiler/LuaProfilerClient/Editor/StartUp.cs
index 7cdd3339..52848481 100644
--- a/LuaProfiler/LuaProfilerClient/Editor/StartUp.cs
+++ b/LuaProfiler/LuaProfilerClient/Editor/StartUp.cs
@@ -464,9 +464,15 @@ public static void Recompile()
                 case BuildTarget.Android:
                     bg = BuildTargetGroup.Android;
                     break;
+            #if (UNITY_5 || UNITY_2017_1_OR_NEWER)
                 case BuildTarget.iOS:
                     bg = BuildTargetGroup.iOS;
                     break;
+            #else
+                case BuildTarget.iPhone:
+                    bg = BuildTargetGroup.iPhone;
+                    break;
+            #endif
             }
             string path = PlayerSettings.GetScriptingDefineSymbolsForGroup(bg);
             bool hasRecompile = false;
diff --git a/LuaProfiler/LuaProfilerClient/Editor/Window/LuaProfilerWindow.cs b/LuaProfiler/LuaProfilerClient/Editor/Window/LuaProfilerWindow.cs
index 7020b806..70624876 100644
--- a/LuaProfiler/LuaProfilerClient/Editor/Window/LuaProfilerWindow.cs
+++ b/LuaProfiler/LuaProfilerClient/Editor/Window/LuaProfilerWindow.cs
@@ -182,6 +182,10 @@ void DoToolbar()
 
         }
 
+    #if !(UNITY_5 || UNITY_2017_1_OR_NEWER)
+        public GUIContent titleContent { get; set; }
+    #endif
+
         // Add menu named "My Window" to the Window menu
         [MenuItem("Window/Lua Profiler Window")]
         static public void ShowWindow()