diff --git a/go.mod b/go.mod
index 932fcb3..ff2bcf0 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module git.beifan.cn/trace-system/backend-go
 go 1.25.0
 
 require (
+	github.com/aliyun/alibabacloud-oss-go-sdk-v2 v1.5.1
 	github.com/gin-contrib/cors v1.7.6
 	github.com/gin-gonic/gin v1.11.0
 	github.com/golang-jwt/jwt/v5 v5.3.1
@@ -46,7 +47,6 @@ require (
 
 require (
 	github.com/KyleBanks/depth v1.2.1 // indirect
-	github.com/aliyun/aliyun-oss-go-sdk v3.0.2+incompatible // indirect
 	github.com/bytedance/gopkg v0.1.3 // indirect
 	github.com/bytedance/sonic v1.15.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
diff --git a/go.sum b/go.sum
index a99362d..40703b3 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,7 @@
 github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
 github.com/KyleBanks/depth v1.2.1/go.mod h1:jzSb9d0L43HxTQfT+oSA1EEp2q+ne2uh6XgeJcm8brE=
-github.com/aliyun/aliyun-oss-go-sdk v3.0.2+incompatible h1:8psS8a+wKfiLt1iVDX79F7Y6wUM49Lcha2FMXt4UM8g=
-github.com/aliyun/aliyun-oss-go-sdk v3.0.2+incompatible/go.mod h1:T/Aws4fEfogEE9v+HPhhw+CntffsBHJ8nXQCwKr0/g8=
+github.com/aliyun/alibabacloud-oss-go-sdk-v2 v1.5.1 h1:vtiFd0hhPAbyYJjztl0wYUq/PqEGkIlDmVuTIy6zw8Y=
+github.com/aliyun/alibabacloud-oss-go-sdk-v2 v1.5.1/go.mod h1:FTzydeQVmR24FI0D6XWUOMKckjXehM/jgMn1xC+DA9M=
 github.com/bytedance/gopkg v0.1.3 h1:TPBSwH8RsouGCBcMBktLt1AymVo2TVsBVCY4b6TnZ/M=
 github.com/bytedance/gopkg v0.1.3/go.mod h1:576VvJ+eJgyCzdjS+c4+77QF3p7ubbtiKARP3TxducM=
 github.com/bytedance/sonic v1.15.0 h1:/PXeWFaR5ElNcVE84U0dOHjiMHQOwNIx3K4ymzh/uSE=
diff --git a/services/oss_service.go b/services/oss_service.go
index 1d42298..57d4d1d 100644
--- a/services/oss_service.go
+++ b/services/oss_service.go
@@ -1,12 +1,15 @@
 package services
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"net/url"
 	"strings"
+	"time"
 
-	"github.com/aliyun/aliyun-oss-go-sdk/oss"
+	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss"
+	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss/credentials"
 
 	"git.beifan.cn/trace-system/backend-go/config"
 )
@@ -25,21 +28,16 @@ func (s OSSService) UploadObject(objectKey string, reader io.Reader, contentType
 		return err
 	}
 
-	client, err := oss.New(normalizeOSSEndpoint(s.cfg.Endpoint), s.cfg.AccessKeyID, s.cfg.AccessKeySecret)
-	if err != nil {
-		return fmt.Errorf("初始化 OSS 客户端失败: %w", err)
+	request := &oss.PutObjectRequest{
+		Bucket: oss.Ptr(s.cfg.Bucket),
+		Key:    oss.Ptr(objectKey),
+		Body:   reader,
 	}
-
-	bucket, err := client.Bucket(s.cfg.Bucket)
-	if err != nil {
-		return fmt.Errorf("打开 OSS Bucket 失败: %w", err)
-	}
-
-	options := []oss.Option{}
 	if contentType != "" {
-		options = append(options, oss.ContentType(contentType))
+		request.ContentType = oss.Ptr(contentType)
 	}
-	if err := bucket.PutObject(objectKey, reader, options...); err != nil {
+
+	if _, err := s.newClient().PutObject(context.TODO(), request); err != nil {
 		return fmt.Errorf("上传现场图片失败: %w", err)
 	}
 
@@ -87,19 +85,22 @@ func (s OSSService) SignedURL(objectKey string) (string, error) {
 	if err := s.validateConfig(); err != nil {
 		return "", err
 	}
-	client, err := oss.New(normalizeOSSEndpoint(s.cfg.Endpoint), s.cfg.AccessKeyID, s.cfg.AccessKeySecret)
-	if err != nil {
-		return "", fmt.Errorf("初始化 OSS 客户端失败: %w", err)
-	}
-	bucket, err := client.Bucket(s.cfg.Bucket)
-	if err != nil {
-		return "", fmt.Errorf("打开 OSS Bucket 失败: %w", err)
-	}
 	expires := s.cfg.SignedURLExpire
 	if expires <= 0 {
 		expires = 3600
 	}
-	return bucket.SignURL(objectKey, oss.HTTPGet, int64(expires))
+	result, err := s.newClient().Presign(
+		context.TODO(),
+		&oss.GetObjectRequest{
+			Bucket: oss.Ptr(s.cfg.Bucket),
+			Key:    oss.Ptr(objectKey),
+		},
+		oss.PresignExpires(time.Duration(expires)*time.Second),
+	)
+	if err != nil {
+		return "", fmt.Errorf("生成 OSS 签名 URL 失败: %w", err)
+	}
+	return result.URL, nil
 }
 
 func (s OSSService) objectKeyFromRef(objectRef string) string {
@@ -138,3 +139,22 @@ func normalizeOSSEndpoint(endpoint string) string {
 	}
 	return "https://" + endpoint
 }
+
+func (s OSSService) newClient() *oss.Client {
+	cfg := oss.LoadDefaultConfig().
+		WithCredentialsProvider(credentials.NewStaticCredentialsProvider(
+			s.cfg.AccessKeyID,
+			s.cfg.AccessKeySecret,
+		)).
+		WithRegion(normalizeOSSRegion(s.cfg.Region)).
+		WithEndpoint(strings.TrimPrefix(strings.TrimPrefix(normalizeOSSEndpoint(s.cfg.Endpoint), "https://"), "http://"))
+	return oss.NewClient(cfg)
+}
+
+func normalizeOSSRegion(region string) string {
+	region = strings.TrimSpace(region)
+	if strings.HasPrefix(region, "oss-") {
+		return strings.TrimPrefix(region, "oss-")
+	}
+	return region
+}