diff --git a/zt-module-infra/zt-module-infra-server/src/main/java/com/zt/plat/module/infra/framework/file/core/client/s3/S3FileClient.java b/zt-module-infra/zt-module-infra-server/src/main/java/com/zt/plat/module/infra/framework/file/core/client/s3/S3FileClient.java
index 8cdce08b..7b716ba8 100644
--- a/zt-module-infra/zt-module-infra-server/src/main/java/com/zt/plat/module/infra/framework/file/core/client/s3/S3FileClient.java
+++ b/zt-module-infra/zt-module-infra-server/src/main/java/com/zt/plat/module/infra/framework/file/core/client/s3/S3FileClient.java
@@ -29,6 +29,9 @@ import java.time.Duration;
  * @author ZT
  */
 public class S3FileClient extends AbstractFileClient<S3FileClientConfig> {
+
+    private static final Duration DEFAULT_PRESIGNED_EXPIRATION = Duration.ofHours(24);
+    private static final String PRESIGN_EXPIRE_SECONDS_PROPERTY = "zt.file.download-expire-seconds";
     /**
      * 生成临时下载地址（预签名下载 URL）
      * @param path 文件路径
@@ -37,17 +40,7 @@ public class S3FileClient extends AbstractFileClient<S3FileClientConfig> {
      */
     @Override
     public String getPresignedDownloadUrl(String path, Duration expiration) {
-        Duration realExpiration = expiration;
-        if (realExpiration == null) {
-            long expireSeconds = 30; // 默认 30 秒
-            try {
-                String val = SpringUtils.getProperty("zt.file.download-expire-seconds");
-                if (val != null && !val.isEmpty()) {
-                    expireSeconds = Long.parseLong(val);
-                }
-            } catch (Exception ignored) {}
-            realExpiration = Duration.ofSeconds(expireSeconds);
-        }
+        Duration realExpiration = expiration != null ? expiration : resolveDefaultExpiration();
         if (path == null){
             return StringUtils.EMPTY;
         }
@@ -135,10 +128,25 @@ public class S3FileClient extends AbstractFileClient<S3FileClientConfig> {
 
     @Override
     public FilePresignedUrlRespDTO getPresignedObjectUrl(String path) {
-        Duration expiration = Duration.ofHours(24);
+        Duration expiration = resolveDefaultExpiration();
         return new FilePresignedUrlRespDTO(getPresignedUrl(path, expiration), config.getDomain() + "/" + path);
     }
 
+    private Duration resolveDefaultExpiration() {
+        String propertyValue = SpringUtils.getProperty(PRESIGN_EXPIRE_SECONDS_PROPERTY);
+        if (StringUtils.isNotEmpty(propertyValue)) {
+            try {
+                long seconds = Long.parseLong(propertyValue);
+                if (seconds > 0) {
+                    return Duration.ofSeconds(seconds);
+                }
+            } catch (NumberFormatException ignored) {
+                // ignore invalid config values and fall back to default
+            }
+        }
+        return DEFAULT_PRESIGNED_EXPIRATION;
+    }
+
     /**
      * 生成动态的预签名上传 URL
      *
diff --git a/zt-module-infra/zt-module-infra-server/src/main/resources/application.yaml b/zt-module-infra/zt-module-infra-server/src/main/resources/application.yaml
index 1d4dd83d..45f2bb3f 100644
--- a/zt-module-infra/zt-module-infra-server/src/main/resources/application.yaml
+++ b/zt-module-infra/zt-module-infra-server/src/main/resources/application.yaml
@@ -148,6 +148,8 @@ zt:
     key: "0123456789abcdef0123456789abcdef"
   # 附件预览
   kkfile: "http://172.16.46.63:30012/onlinePreview?url="
+  file:
+    download-expire-seconds: 86400 # 对象存储预签名地址默认有效期（秒）
   info:
     version: 1.0.0
     base-package: com.zt.plat.module.infra
diff --git a/zt-server/src/main/resources/application.yaml b/zt-server/src/main/resources/application.yaml
index d502e1d9..fc8bd152 100644
--- a/zt-server/src/main/resources/application.yaml
+++ b/zt-server/src/main/resources/application.yaml
@@ -257,6 +257,8 @@ zt:
   info:
     version: 1.0.0
     base-package: com.zt.plat
+  file:
+    download-expire-seconds: 86400 # 对象存储预签名地址默认有效期（秒）
   web:
     admin-ui:
       url: http://dashboard.zt.iocoder.cn # Admin 管理后台 UI 的地址