diff --git a/RScriptContext.cs b/RScriptContext.cs
index 39ea410..ea0bf44 100644
--- a/RScriptContext.cs
+++ b/RScriptContext.cs
@@ -1,6 +1,7 @@
 using Convention.RScript.Matcher;
 using Convention.RScript.Parser;
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -293,17 +294,13 @@ namespace Convention.RScript
             }
         }
 
-        private void RunNextStep(ExpressionParser parser)
+        private object RunNextStep(ExpressionParser parser)
         {
             var sentence = CurrentSentence;
             switch (sentence.mode)
             {
                 case RScriptSentence.Mode.Expression:
-                    {
-                        // 执行表达式
-                        parser.Evaluate(sentence.content);
-                    }
-                    break;
+                    return parser.Evaluate(sentence.content);
                 case RScriptSentence.Mode.DefineVariable:
                     {
                         DoDefineVariable(parser, sentence);
@@ -326,7 +323,7 @@ namespace Convention.RScript
                     break;
                 case RScriptSentence.Mode.Breakpoint:
                     {
-                        DoBreakpoint(parser,sentence);
+                        DoBreakpoint(parser, sentence);
                     }
                     break;
                 case RScriptSentence.Mode.Backpoint:
@@ -338,6 +335,7 @@ namespace Convention.RScript
                     // Do nothing
                     break;
             }
+            return null;
         }
 
         private readonly Stack<int> RuntimePointerStack = new();
@@ -345,7 +343,17 @@ namespace Convention.RScript
         private int CurrentRuntimePointer = 0;
         private readonly Stack<HashSet<string>> CurrentLocalSpaceVariableNames = new();
 
-        public Dictionary<string, RScriptVariableEntry> Run(ExpressionParser parser)
+        public Dictionary<string, RScriptVariableEntry> GetCurrentVariables()
+        {
+            Dictionary<string, RScriptVariableEntry> result = new();
+            foreach (var (key, value) in Variables)
+            {
+                result[key] = value;
+            }
+            return result;
+        }
+
+        public void Run(ExpressionParser parser)
         {
             CurrentLocalSpaceVariableNames.Clear();
             RuntimePointerStack.Clear();
@@ -362,12 +370,30 @@ namespace Convention.RScript
                 if (Variables.ContainsKey(varName))
                     Variables.SetValue(varName, varValue);
             }
-            Dictionary<string, RScriptVariableEntry> result = new();
-            foreach (var (key, value) in Variables)
+        }
+
+        public IEnumerator RunAsync(ExpressionParser parser)
+        {
+            CurrentLocalSpaceVariableNames.Clear();
+            RuntimePointerStack.Clear();
+            GotoPointerStack.Clear();
+            CurrentLocalSpaceVariableNames.Clear();
+            CurrentLocalSpaceVariableNames.Push(new());
+            for (CurrentRuntimePointer = 0; CurrentRuntimePointer < Sentences.Length; CurrentRuntimePointer++)
             {
-                result[key] = value;
+                var ret = RunNextStep(parser);
+                if (ret is IEnumerator ir)
+                {
+                    yield return ir;
+                }
+                yield return null;
+            }
+            // 更新上下文变量
+            foreach (var (varName, varValue) in parser.context.Variables)
+            {
+                if (Variables.ContainsKey(varName))
+                    Variables.SetValue(varName, varValue);
             }
-            return result;
         }
     }
 }
diff --git a/RScriptEngine.cs b/RScriptEngine.cs
index 7ed71ee..3862704 100644
--- a/RScriptEngine.cs
+++ b/RScriptEngine.cs
@@ -1,5 +1,6 @@
 using Convention.RScript.Parser;
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -105,7 +106,17 @@ namespace Convention.RScript
             context = new(SplitScript(script).ToArray(), import, variables);
             foreach (var type in context.Import)
                 parser.context.Imports.AddType(type);
-            return context.Run(parser);
+            context.Run(parser);
+            return context.GetCurrentVariables();
+        }
+
+        public IEnumerator RunAsync(string script, RScriptImportClass import = null, RScriptVariables variables = null)
+        {
+            parser = new(new());
+            context = new(SplitScript(script).ToArray(), import, variables);
+            foreach (var type in context.Import)
+                parser.context.Imports.AddType(type);
+            return context.RunAsync(parser);
         }
     }
 }