diff --git a/.env.release.example b/.env.release.example
index 2df6f083a..a6eadf21c 100644
--- a/.env.release.example
+++ b/.env.release.example
@@ -40,6 +40,8 @@ SKILLHUB_STORAGE_S3_ACCESS_KEY=replace-me
 SKILLHUB_STORAGE_S3_SECRET_KEY=replace-me
 SKILLHUB_STORAGE_S3_REGION=cn-shanghai
 SKILLHUB_STORAGE_S3_FORCE_PATH_STYLE=false
+# Aliyun OSS rejects aws-chunked encoding; set to true when targeting Aliyun OSS.
+SKILLHUB_STORAGE_S3_DISABLE_CHUNKED_ENCODING=true
 SKILLHUB_STORAGE_S3_AUTO_CREATE_BUCKET=false
 SKILLHUB_STORAGE_S3_PRESIGN_EXPIRY=PT10M
 
diff --git a/server/skillhub-app/src/main/resources/application.yml b/server/skillhub-app/src/main/resources/application.yml
index 0cc32ec46..a592b0359 100644
--- a/server/skillhub-app/src/main/resources/application.yml
+++ b/server/skillhub-app/src/main/resources/application.yml
@@ -120,6 +120,7 @@ skillhub:
       secret-key: ${SKILLHUB_STORAGE_S3_SECRET_KEY:}
       region: ${SKILLHUB_STORAGE_S3_REGION:us-east-1}
       force-path-style: ${SKILLHUB_STORAGE_S3_FORCE_PATH_STYLE:true}
+      disable-chunked-encoding: ${SKILLHUB_STORAGE_S3_DISABLE_CHUNKED_ENCODING:false}
       auto-create-bucket: ${SKILLHUB_STORAGE_S3_AUTO_CREATE_BUCKET:false}
       presign-expiry: ${SKILLHUB_STORAGE_S3_PRESIGN_EXPIRY:PT10M}
       max-connections: ${SKILLHUB_STORAGE_S3_MAX_CONNECTIONS:100}
diff --git a/server/skillhub-storage/src/main/java/com/iflytek/skillhub/storage/S3StorageProperties.java b/server/skillhub-storage/src/main/java/com/iflytek/skillhub/storage/S3StorageProperties.java
index 0e50ef9ed..cdd77f02c 100644
--- a/server/skillhub-storage/src/main/java/com/iflytek/skillhub/storage/S3StorageProperties.java
+++ b/server/skillhub-storage/src/main/java/com/iflytek/skillhub/storage/S3StorageProperties.java
@@ -15,6 +15,7 @@ public class S3StorageProperties {
     private String secretKey;
     private String region = "us-east-1";
     private boolean forcePathStyle = true;
+    private boolean disableChunkedEncoding = false;
     private boolean autoCreateBucket = false;
     private Duration presignExpiry = Duration.ofMinutes(10);
     private Integer maxConnections = 100;
@@ -36,6 +37,8 @@ public class S3StorageProperties {
     public void setRegion(String region) { this.region = region; }
     public boolean isForcePathStyle() { return forcePathStyle; }
     public void setForcePathStyle(boolean forcePathStyle) { this.forcePathStyle = forcePathStyle; }
+    public boolean isDisableChunkedEncoding() { return disableChunkedEncoding; }
+    public void setDisableChunkedEncoding(boolean disableChunkedEncoding) { this.disableChunkedEncoding = disableChunkedEncoding; }
     public boolean isAutoCreateBucket() { return autoCreateBucket; }
     public void setAutoCreateBucket(boolean autoCreateBucket) { this.autoCreateBucket = autoCreateBucket; }
     public Duration getPresignExpiry() { return presignExpiry; }
diff --git a/server/skillhub-storage/src/main/java/com/iflytek/skillhub/storage/S3StorageService.java b/server/skillhub-storage/src/main/java/com/iflytek/skillhub/storage/S3StorageService.java
index e13adb402..ba0250bf7 100644
--- a/server/skillhub-storage/src/main/java/com/iflytek/skillhub/storage/S3StorageService.java
+++ b/server/skillhub-storage/src/main/java/com/iflytek/skillhub/storage/S3StorageService.java
@@ -78,7 +78,10 @@ protected S3Client buildS3Client(ApacheHttpClient.Builder httpClientBuilder) {
         var builder = S3Client.builder()
                 .region(Region.of(properties.getRegion()))
                 .credentialsProvider(buildCredentialsProvider())
-                .forcePathStyle(properties.isForcePathStyle())
+                .serviceConfiguration(S3Configuration.builder()
+                        .pathStyleAccessEnabled(properties.isForcePathStyle())
+                        .chunkedEncodingEnabled(!properties.isDisableChunkedEncoding())
+                        .build())
                 .httpClientBuilder(httpClientBuilder)
                 .overrideConfiguration(config -> config
                         .apiCallAttemptTimeout(properties.getApiCallAttemptTimeout())
diff --git a/server/skillhub-storage/src/test/java/com/iflytek/skillhub/storage/S3StorageServiceTest.java b/server/skillhub-storage/src/test/java/com/iflytek/skillhub/storage/S3StorageServiceTest.java
index b18c737ce..5c89448bf 100644
--- a/server/skillhub-storage/src/test/java/com/iflytek/skillhub/storage/S3StorageServiceTest.java
+++ b/server/skillhub-storage/src/test/java/com/iflytek/skillhub/storage/S3StorageServiceTest.java
@@ -39,6 +39,17 @@
 
 class S3StorageServiceTest {
 
+    @Test
+    void buildS3ClientShouldDisableChunkedEncodingWhenConfigured() {
+        S3StorageProperties props = createProperties(true);
+        props.setDisableChunkedEncoding(true);
+        S3StorageService service = new S3StorageService(props);
+        ApacheHttpClient.Builder httpClientBuilder = ApacheHttpClient.builder();
+        S3Client client = service.buildS3Client(httpClientBuilder);
+        assertThat(client).isNotNull();
+        client.close();
+    }
+
     @Test
     void shouldUsePathStylePresignedUrlWhenForcePathStyleEnabled() {
         URI presignedUrl = presignGetObjectUrl(true);