diff --git a/utils/src/main/kotlin/cn/tursom/utils/coroutine/CoroutineLocal.kt b/utils/src/main/kotlin/cn/tursom/utils/coroutine/CoroutineLocal.kt
index 9a298ce..e3e3bb9 100644
--- a/utils/src/main/kotlin/cn/tursom/utils/coroutine/CoroutineLocal.kt
+++ b/utils/src/main/kotlin/cn/tursom/utils/coroutine/CoroutineLocal.kt
@@ -1,6 +1,7 @@
 package cn.tursom.utils.coroutine
 
 import cn.tursom.core.cast
+import cn.tursom.core.toHexString
 import kotlinx.coroutines.Job
 import java.util.concurrent.ConcurrentHashMap
 import kotlin.coroutines.CoroutineContext
@@ -43,6 +44,8 @@ open class CoroutineLocal<T> {
     return true
   }
 
+  override fun toString(): String = "CoroutineLocal@${hashCode().toHexString(false)}"
+
   companion object {
     private val attachMap = ConcurrentHashMap<CoroutineContext, MutableMap<CoroutineLocal<*>, Any?>>()
     override fun toString(): String = attachMap.toString()
diff --git a/utils/src/main/kotlin/cn/tursom/utils/coroutine/MainCoroutineDispatcherFactory.kt b/utils/src/main/kotlin/cn/tursom/utils/coroutine/MainCoroutineDispatcherFactory.kt
new file mode 100644
index 0000000..3ad4214
--- /dev/null
+++ b/utils/src/main/kotlin/cn/tursom/utils/coroutine/MainCoroutineDispatcherFactory.kt
@@ -0,0 +1,13 @@
+package cn.tursom.utils.coroutine
+
+import kotlinx.coroutines.InternalCoroutinesApi
+import kotlinx.coroutines.MainCoroutineDispatcher
+import kotlinx.coroutines.internal.MainDispatcherFactory
+
+@Suppress("unused")
+@InternalCoroutinesApi
+class MainCoroutineDispatcherFactory : MainDispatcherFactory {
+  override val loadPriority: Int = 1
+
+  override fun createDispatcher(allFactories: List<MainDispatcherFactory>): MainCoroutineDispatcher = MainDispatcher
+}
\ No newline at end of file
diff --git a/utils/src/main/kotlin/cn/tursom/utils/coroutine/MainDispatcher.kt b/utils/src/main/kotlin/cn/tursom/utils/coroutine/MainDispatcher.kt
index d8119a9..8847e1a 100644
--- a/utils/src/main/kotlin/cn/tursom/utils/coroutine/MainDispatcher.kt
+++ b/utils/src/main/kotlin/cn/tursom/utils/coroutine/MainDispatcher.kt
@@ -1,27 +1,42 @@
 package cn.tursom.utils.coroutine
 
+import cn.tursom.core.cast
+import kotlinx.coroutines.ExecutorCoroutineDispatcher
 import kotlinx.coroutines.MainCoroutineDispatcher
 import kotlinx.coroutines.asCoroutineDispatcher
 import java.io.Closeable
 import java.lang.reflect.Field
 import java.lang.reflect.Modifier
 import java.util.concurrent.Executors
+import java.util.concurrent.atomic.AtomicBoolean
 import kotlin.concurrent.thread
 import kotlin.coroutines.CoroutineContext
 
 object MainDispatcher : MainCoroutineDispatcher(), Closeable {
-  private val dispatcher = Executors.newSingleThreadExecutor {
-    thread(start = false, block = it::run, name = "mainDispatcher", isDaemon = false)
+  private val loaded = AtomicBoolean(false)
+  private val dispatcher: ExecutorCoroutineDispatcher = Executors.newSingleThreadExecutor {
+    thread(start = false, block = it::run, name = "MainDispatcher", isDaemon = false)
   }.asCoroutineDispatcher()
-
-  fun init() {
-    val mainDispatcherLoader = Class.forName("kotlinx.coroutines.internal.MainDispatcherLoader")
-    val dispatcher = mainDispatcherLoader.getDeclaredField("dispatcher")
+  private var oldDispatcher: MainCoroutineDispatcher? = null
+  private val mainDispatcherLoader: Class<*> = Class.forName("kotlinx.coroutines.internal.MainDispatcherLoader")
+  private val dispatcherField: Field = mainDispatcherLoader.getDeclaredField("dispatcher").also { dispatcher ->
     dispatcher.isAccessible = true
     val mf: Field = Field::class.java.getDeclaredField("modifiers")
     mf.isAccessible = true
     mf.setInt(dispatcher, dispatcher.modifiers and Modifier.FINAL.inv())
-    dispatcher.set(null, this)
+  }
+
+  fun init() {
+    if (loaded.compareAndSet(false, true)) {
+      oldDispatcher = dispatcherField.get(null).cast()
+      dispatcherField.set(null, this)
+    }
+  }
+
+  fun resume() {
+    if (loaded.compareAndSet(true, false) && oldDispatcher != null) {
+      dispatcherField.set(null, oldDispatcher)
+    }
   }
 
   override val immediate: MainCoroutineDispatcher get() = this
diff --git a/utils/src/main/kotlin/cn/tursom/utils/coroutine/utils.kt b/utils/src/main/kotlin/cn/tursom/utils/coroutine/utils.kt
index 3eeb81a..faee0a1 100644
--- a/utils/src/main/kotlin/cn/tursom/utils/coroutine/utils.kt
+++ b/utils/src/main/kotlin/cn/tursom/utils/coroutine/utils.kt
@@ -218,4 +218,12 @@ fun combinedContext(coroutineContext: CoroutineContext): Boolean {
     left.set(coroutineContext, leftObj + CoroutineLocalContext())
   }
   return true
+}
+
+//fun CoroutineScope.runOnUiThread(action: suspend CoroutineScope.() -> Unit): Job {
+//  return launch(Dispatchers.Main, block = action)
+//}
+
+suspend fun <T> runOnUiThread(action: suspend CoroutineScope.() -> T): T {
+  return withContext(Dispatchers.Main, action)
 }
\ No newline at end of file
diff --git a/utils/src/main/resources/META-INF/services/kotlinx.coroutines.internal.MainDispatcherFactory b/utils/src/main/resources/META-INF/services/kotlinx.coroutines.internal.MainDispatcherFactory
new file mode 100644
index 0000000..e4f9d18
--- /dev/null
+++ b/utils/src/main/resources/META-INF/services/kotlinx.coroutines.internal.MainDispatcherFactory
@@ -0,0 +1 @@
+cn.tursom.utils.coroutine.MainDispatcherFactory
\ No newline at end of file
diff --git a/utils/src/test/kotlin/cn/tursom/utils/coroutine/CoroutineLocalTest.kt b/utils/src/test/kotlin/cn/tursom/utils/coroutine/CoroutineLocalTest.kt
index a91cd80..13bdd73 100644
--- a/utils/src/test/kotlin/cn/tursom/utils/coroutine/CoroutineLocalTest.kt
+++ b/utils/src/test/kotlin/cn/tursom/utils/coroutine/CoroutineLocalTest.kt
@@ -23,23 +23,29 @@ interface CoroutineLocalTest {
 }
 
 class Test : CoroutineScope by MainScope() {
-  suspend fun test(): Job {
-    println(this)
+  suspend fun test() {
+    testCoroutineLocal.set(1)
     println(coroutineContext)
-    return coroutineScope {
-      println(this)
+    coroutineScope {
       println(coroutineContext)
-      println(Thread.currentThread().name)
       delay(1)
-      return@coroutineScope launch {
-        println(Thread.currentThread().name)
-      }
     }
   }
 }
 
 suspend fun main() {
-  MainDispatcher.init()
-  Test().test().join()
+  //MainDispatcher.init()
+  runOnUiThread {
+    Test().test()
+    println(testCoroutineLocal.get())
+    println(coroutineContext)
+    GlobalScope.launch(Dispatchers.Main) {
+      println(coroutineContext)
+    }
+    //runOnUiThread {
+    //  println(coroutineContext)
+    //  println(testCoroutineLocal.get())
+    //}
+  }
   MainDispatcher.close()
 }
\ No newline at end of file