diff --git a/Frontend/Pages/Index.razor b/Frontend/Pages/Index.razor
index 2768761..2a17ff5 100644
--- a/Frontend/Pages/Index.razor
+++ b/Frontend/Pages/Index.razor
@@ -1,7 +1,7 @@
 @page "/"
 @using Frontend.Models
-@using Katheryne.Services
-@inject KatheryneChatRobotFactory ChatRobotFactory
+@using Katheryne.Abstractions
+@inject IChatRobotFactory ChatRobotFactory
 
 
 <Layout>
diff --git a/Katheryne/Abstractions/IChatRobotFactory.cs b/Katheryne/Abstractions/IChatRobotFactory.cs
new file mode 100644
index 0000000..d8b7127
--- /dev/null
+++ b/Katheryne/Abstractions/IChatRobotFactory.cs
@@ -0,0 +1,27 @@
+using Katheryne.Exceptions;
+
+namespace Katheryne.Abstractions;
+
+/// <summary>
+/// 聊天机器人接口
+/// </summary>
+public interface IChatRobotFactory
+{
+    /// <summary>
+    /// 当前使用的语法文本
+    /// </summary>
+    public string GrammarText { get; }
+
+    /// <summary>
+    /// 设置当前机器人使用的文法
+    /// </summary>
+    /// <param name="grammarText">文法字符串</param>
+    /// <exception cref="GrammarException">编译文法失败抛出的异常</exception>
+    public void SetGrammar(string grammarText);
+
+    /// <summary>
+    /// 获得聊天机器人
+    /// </summary>
+    /// <returns>使用当前文法的机器人</returns>
+    public IChatRobot GetRobot();
+}
\ No newline at end of file
diff --git a/Katheryne/ServiceCollectionExtensions.cs b/Katheryne/ServiceCollectionExtensions.cs
index e4bbd1c..a2a2b55 100644
--- a/Katheryne/ServiceCollectionExtensions.cs
+++ b/Katheryne/ServiceCollectionExtensions.cs
@@ -1,3 +1,4 @@
+using Katheryne.Abstractions;
 using Katheryne.Services;
 using Microsoft.Extensions.DependencyInjection;
 
@@ -9,6 +10,6 @@ public static class ServiceCollectionExtensions
     {
         collection.AddSingleton<YamlDeserializerFactory>();
         collection.AddSingleton<DefaultChatRobot>();
-        collection.AddSingleton<KatheryneChatRobotFactory>();
+        collection.AddSingleton<IChatRobotFactory, KatheryneChatRobotFactory>();
     }
 }
\ No newline at end of file
diff --git a/Katheryne/Services/KatheryneChatRobotFactory.cs b/Katheryne/Services/KatheryneChatRobotFactory.cs
index 2206bbb..43af940 100644
--- a/Katheryne/Services/KatheryneChatRobotFactory.cs
+++ b/Katheryne/Services/KatheryneChatRobotFactory.cs
@@ -6,7 +6,7 @@ using YamlDotNet.Serialization;
 
 namespace Katheryne.Services;
 
-public class KatheryneChatRobotFactory
+public class KatheryneChatRobotFactory : IChatRobotFactory
 {
     private readonly YamlDeserializerFactory _deserializerFactory;
     private readonly ILogger<KatheryneChatRobotFactory> _factoryLogger;