diff --git a/framework/src/Volo.Abp.Sms.Aliyun/Volo.Abp.Sms.Aliyun.csproj b/framework/src/Volo.Abp.Sms.Aliyun/Volo.Abp.Sms.Aliyun.csproj
index 8b007b7a4a..e59ce4be49 100644
--- a/framework/src/Volo.Abp.Sms.Aliyun/Volo.Abp.Sms.Aliyun.csproj
+++ b/framework/src/Volo.Abp.Sms.Aliyun/Volo.Abp.Sms.Aliyun.csproj
@@ -4,6 +4,8 @@
 
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <AssemblyName>Volo.Abp.Sms.Aliyun</AssemblyName>
         <PackageId>Volo.Abp.Sms.Aliyun</PackageId>
         <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
diff --git a/framework/src/Volo.Abp.Sms.Aliyun/Volo/Abp/Sms/Aliyun/AbpAliyunSmsOptions.cs b/framework/src/Volo.Abp.Sms.Aliyun/Volo/Abp/Sms/Aliyun/AbpAliyunSmsOptions.cs
index 1b3eac289c..895e03c710 100644
--- a/framework/src/Volo.Abp.Sms.Aliyun/Volo/Abp/Sms/Aliyun/AbpAliyunSmsOptions.cs
+++ b/framework/src/Volo.Abp.Sms.Aliyun/Volo/Abp/Sms/Aliyun/AbpAliyunSmsOptions.cs
@@ -2,9 +2,9 @@ namespace Volo.Abp.Sms.Aliyun;
 
 public class AbpAliyunSmsOptions
 {
-    public string AccessKeySecret { get; set; }
+    public string AccessKeySecret { get; set; } = default!;
 
-    public string AccessKeyId { get; set; }
+    public string AccessKeyId { get; set; } = default!;
 
-    public string EndPoint { get; set; }
+    public string EndPoint { get; set; } = default!;
 }