diff --git a/sample/Cnblogs.DashScope.Sample/Program.cs b/sample/Cnblogs.DashScope.Sample/Program.cs
index c5958f3..8841af4 100644
--- a/sample/Cnblogs.DashScope.Sample/Program.cs
+++ b/sample/Cnblogs.DashScope.Sample/Program.cs
@@ -56,6 +56,13 @@
     case SampleType.MicrosoftExtensionsAiToolCall:
         await dashScopeClient.ToolCallWithExtensionAsync();
         break;
+    case SampleType.ApplicationCall:
+        Console.Write("Application Id > ");
+        var applicationId = Console.ReadLine()!;
+        Console.Write("Prompt > ");
+        userInput = Console.ReadLine()!;
+        await ApplicationCallAsync(applicationId, userInput);
+        break;
 }
 
 return;
@@ -215,3 +222,10 @@ async Task ChatWithMicrosoftExtensions()
     var serializerOptions = new JsonSerializerOptions(JsonSerializerDefaults.Web) { WriteIndented = true };
     Console.WriteLine(JsonSerializer.Serialize(response, serializerOptions));
 }
+
+async Task ApplicationCallAsync(string applicationId, string prompt)
+{
+    var request = new ApplicationRequest() { Input = new ApplicationInput() { Prompt = prompt } };
+    var response = await dashScopeClient.GetApplicationResponseAsync(applicationId, request);
+    Console.WriteLine(response.Output.Text);
+}
diff --git a/sample/Cnblogs.DashScope.Sample/SampleType.cs b/sample/Cnblogs.DashScope.Sample/SampleType.cs
index 94d119d..feddf79 100644
--- a/sample/Cnblogs.DashScope.Sample/SampleType.cs
+++ b/sample/Cnblogs.DashScope.Sample/SampleType.cs
@@ -14,5 +14,7 @@ public enum SampleType
 
     MicrosoftExtensionsAi,
 
-    MicrosoftExtensionsAiToolCall
+    MicrosoftExtensionsAiToolCall,
+
+    ApplicationCall
 }
diff --git a/sample/Cnblogs.DashScope.Sample/SampleTypeDescriptor.cs b/sample/Cnblogs.DashScope.Sample/SampleTypeDescriptor.cs
index e39f284..26988a5 100644
--- a/sample/Cnblogs.DashScope.Sample/SampleTypeDescriptor.cs
+++ b/sample/Cnblogs.DashScope.Sample/SampleTypeDescriptor.cs
@@ -13,6 +13,7 @@ public static string GetDescription(this SampleType sampleType)
             SampleType.ChatCompletionWithFiles => "File upload sample using qwen-long",
             SampleType.MicrosoftExtensionsAi => "Use with Microsoft.Extensions.AI",
             SampleType.MicrosoftExtensionsAiToolCall => "Use tool call with Microsoft.Extensions.AI interfaces",
+            SampleType.ApplicationCall => "Call pre-defined application",
             _ => throw new ArgumentOutOfRangeException(nameof(sampleType), sampleType, "Unsupported sample option")
         };
     }
diff --git a/src/Cnblogs.DashScope.Core/ApplicationRequest.cs b/src/Cnblogs.DashScope.Core/ApplicationRequest.cs
index ca67ff4..b367d5e 100644
--- a/src/Cnblogs.DashScope.Core/ApplicationRequest.cs
+++ b/src/Cnblogs.DashScope.Core/ApplicationRequest.cs
@@ -15,7 +15,7 @@ public class ApplicationRequest<TBizParams>
     /// <summary>
     /// Optional configurations.
     /// </summary>
-    public required ApplicationParameters? Parameters { get; init; }
+    public ApplicationParameters? Parameters { get; init; }
 }
 
 /// <summary>