diff --git a/Katheryne.Tests/StringFormatterTests.cs b/Katheryne.Tests/StringFormatterTests.cs
new file mode 100644
index 0000000..d9d697d
--- /dev/null
+++ b/Katheryne.Tests/StringFormatterTests.cs
@@ -0,0 +1,37 @@
+using System.Text.RegularExpressions;
+using Katheryne.Models;
+
+namespace Katheryne.Tests;
+
+public class StringFormatterTests
+{
+    [Fact]
+    public void FormatTest1()
+    {
+        StringFormatter formatter = new("Hello $1");
+
+        Regex regex = new("I'm (.*)");
+
+        Match match = regex.Match("I'm jackfiled");
+        
+        Assert.True(match.Success);
+        Assert.True(formatter.IsFormat);
+        
+        Assert.Equal("Hello jackfiled", formatter.Format(match.Groups));
+    }
+
+    [Fact]
+    public void FormatTest2()
+    {
+        StringFormatter formatter = new("$你好呀 $1, 欢迎你离开垃圾的$2.");
+
+        Regex regex = new("你好，我是(.*)，我来自(.*)\\.");
+
+        Match match = regex.Match("你好，我是Ichirinko，我来自Trinity.");
+        
+        Assert.True(match.Success);
+        Assert.True(formatter.IsFormat);
+        
+        Assert.Equal("$你好呀 Ichirinko, 欢迎你离开垃圾的Trinity.", formatter.Format(match.Groups));
+    }
+}
\ No newline at end of file
diff --git a/Katheryne/KatheryneChatRobot.cs b/Katheryne/KatheryneChatRobot.cs
index 94c226e..9537f56 100644
--- a/Katheryne/KatheryneChatRobot.cs
+++ b/Katheryne/KatheryneChatRobot.cs
@@ -27,7 +27,7 @@ public class KatheryneChatRobot : IChatRobot
     {
         return new[]
         {
-            _grammarTree[_currentStage].Answer
+            _grammarTree[_currentStage].Answer.RowString
         };
     }
 
@@ -55,7 +55,17 @@ public class KatheryneChatRobot : IChatRobot
             if (match.Success)
             {
                 _currentStage = transformer.NextStage;
-                result.Add(_grammarTree[_currentStage].Answer);
+                StringFormatter answer = _grammarTree[_currentStage].Answer;
+                if (answer.IsFormat)
+                {
+                    string temp = answer.Format(match.Groups);
+                    _logger.LogInformation("Format answer {} to {}.", answer.RowString, temp);
+                    result.Add(temp);
+                }
+                else
+                {
+                    result.Add(answer.RowString);
+                }
                 _logger.LogInformation("Moving to stage {} on input {}.", _currentStage, input);
                 break;
             }
@@ -81,7 +91,7 @@ public class KatheryneChatRobot : IChatRobot
                 {
                     flag = true;
                     _currentStage = transformer.NextStage;
-                    result.Add(_grammarTree[_currentStage].Answer);
+                    result.Add(_grammarTree[_currentStage].Answer.RowString);
                     
                     _logger.LogInformation("Moving to stage {} with empty transform.", _currentStage);
                     break;
diff --git a/Katheryne/Models/FormatTag.cs b/Katheryne/Models/FormatTag.cs
new file mode 100644
index 0000000..112ba8e
--- /dev/null
+++ b/Katheryne/Models/FormatTag.cs
@@ -0,0 +1,3 @@
+namespace Katheryne.Models;
+
+public record FormatTag(string Value, int Index);
\ No newline at end of file
diff --git a/Katheryne/Models/InnerStage.cs b/Katheryne/Models/InnerStage.cs
index 29aec60..4eacdd8 100644
--- a/Katheryne/Models/InnerStage.cs
+++ b/Katheryne/Models/InnerStage.cs
@@ -6,12 +6,12 @@ internal class InnerStage
 
     public List<InnerTransformer> Transformers { get; } = new();
         
-    public string Answer { get; }
+    public StringFormatter Answer { get; }
 
     public InnerStage(Stage stage)
     {
         Name = stage.Name;
-        Answer = stage.Answer;
+        Answer = new StringFormatter(stage.Answer);
 
         foreach (Transformer transformer in stage.Transformers)
         {
diff --git a/Katheryne/Models/StringFormatter.cs b/Katheryne/Models/StringFormatter.cs
new file mode 100644
index 0000000..76b7da9
--- /dev/null
+++ b/Katheryne/Models/StringFormatter.cs
@@ -0,0 +1,78 @@
+using System.Text.RegularExpressions;
+
+namespace Katheryne.Models;
+
+/// <summary>
+/// 格式化字符串模型类
+/// </summary>
+public class StringFormatter
+{
+    private readonly string _originString;
+    private readonly List<FormatTag> _formatTags = new();
+
+    public StringFormatter(string originString)
+    {
+        _originString = originString;
+        
+        GetFormatTags();
+    }
+
+    public bool IsFormat => _formatTags.Count != 0;
+
+    public string RowString => _originString;
+
+    public string Format(GroupCollection collection)
+    {
+        var result = new string(_originString);
+
+        foreach (FormatTag tag in _formatTags)
+        {
+            if (tag.Index > collection.Count)
+            {
+                continue;
+            }
+
+            result = result.Replace(tag.Value, collection[tag.Index].Value);
+        }
+
+        return result;
+    }
+
+    private void GetFormatTags()
+    {
+        List<int> indexes = new();
+
+        for (var i = 0; i < _originString.Length; i++)
+        {
+            if (_originString[i] == '$')
+            {
+                indexes.Add(i);
+            }
+        }
+
+        foreach (int index in indexes)
+        {
+            string value = string.Empty;
+            int pos = index + 1;
+
+            // 如果 $ 之后的字符不是数字就忽略处理
+            if (_originString[pos] < '0' || _originString[pos] > '9')
+            {
+                continue;
+            }
+
+            while (_originString[pos] >= '0' && _originString[pos] <= '9')
+            {
+                value = value + _originString[pos];
+                pos++;
+
+                if (pos >= _originString.Length)
+                {
+                    break;
+                }
+            }
+            
+            _formatTags.Add(new FormatTag('$' + value, int.Parse(value)));
+        }
+    }
+}
\ No newline at end of file