diff --git a/services/delivery-platform-api/src/main/java/cn/craftlabs/platform/api/preview/DocumentPreviewController.java b/services/delivery-platform-api/src/main/java/cn/craftlabs/platform/api/preview/DocumentPreviewController.java
new file mode 100644
index 0000000..52c2e15
--- /dev/null
+++ b/services/delivery-platform-api/src/main/java/cn/craftlabs/platform/api/preview/DocumentPreviewController.java
@@ -0,0 +1,84 @@
+package cn.craftlabs.platform.api.preview;
+
+import cn.craftlabs.platform.api.persistence.attachment.PlatformContractAttachment;
+import cn.craftlabs.platform.api.persistence.attachment.PlatformContractAttachmentMapper;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.core.io.Resource;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/v1/preview")
+public class DocumentPreviewController {
+
+    private final PlatformContractAttachmentMapper attachmentMapper;
+
+    @Value("${onlyoffice.url:http://craftsupport.cn:8088}")
+    private String onlyofficeUrl;
+
+    public DocumentPreviewController(PlatformContractAttachmentMapper attachmentMapper) {
+        this.attachmentMapper = attachmentMapper;
+    }
+
+    @GetMapping("/{attachmentId}")
+    public ResponseEntity<Map<String, Object>> getPreviewConfig(@PathVariable("attachmentId") Long attachmentId) {
+        PlatformContractAttachment attachment = attachmentMapper.selectById(attachmentId);
+        if (attachment == null) {
+            throw new ResponseStatusException(org.springframework.http.HttpStatus.NOT_FOUND, "附件不存在");
+        }
+
+        String ext = "";
+        String fileName = attachment.getFileName();
+        if (fileName != null && fileName.contains(".")) {
+            ext = fileName.substring(fileName.lastIndexOf('.') + 1).toLowerCase();
+        }
+
+        Map<String, Object> config = new java.util.LinkedHashMap<>();
+        config.put("document", Map.of(
+            "fileType", ext,
+            "key", "attachment_" + attachmentId,
+            "title", attachment.getFileName(),
+            "url", getFileUrl(attachmentId),
+            "permissions", Map.of("download", false, "edit", false, "print", false)
+        ));
+        config.put("editorConfig", Map.of(
+            "mode", "view",
+            "customization", Map.of("autosave", false, "chat", false, "compactHeader", true)
+        ));
+        config.put("documentServerUrl", onlyofficeUrl);
+
+        return ResponseEntity.ok(config);
+    }
+
+    @GetMapping("/{attachmentId}/file")
+    public ResponseEntity<Resource> getFile(@PathVariable("attachmentId") Long attachmentId) {
+        PlatformContractAttachment attachment = attachmentMapper.selectById(attachmentId);
+        if (attachment == null) {
+            throw new ResponseStatusException(org.springframework.http.HttpStatus.NOT_FOUND, "附件不存在");
+        }
+
+        java.io.File file = new java.io.File(attachment.getFilePath());
+        if (!file.exists()) {
+            throw new ResponseStatusException(org.springframework.http.HttpStatus.NOT_FOUND, "文件不存在");
+        }
+
+        FileSystemResource resource = new FileSystemResource(file);
+        String contentType = attachment.getContentType();
+        if (contentType == null) contentType = "application/octet-stream";
+
+        return ResponseEntity.ok()
+                .contentType(MediaType.parseMediaType(contentType))
+                .header(HttpHeaders.CONTENT_DISPOSITION, "inline; filename=\"" + attachment.getFileName() + "\"")
+                .body(resource);
+    }
+
+    private String getFileUrl(Long attachmentId) {
+        return "/api/v1/preview/" + attachmentId + "/file";
+    }
+}
diff --git a/web/delivery-platform-ui/src/views/ContractDetailView.vue b/web/delivery-platform-ui/src/views/ContractDetailView.vue
index 4846efa..e6c015d 100644
--- a/web/delivery-platform-ui/src/views/ContractDetailView.vue
+++ b/web/delivery-platform-ui/src/views/ContractDetailView.vue
@@ -86,9 +86,18 @@
             <template #default="{ row }">{{ (row.fileSize / 1024).toFixed(1) }} KB</template>
           </el-table-column>
           <el-table-column prop="createdAt" label="上传时间" width="170" />
+          <el-table-column label="操作" width="80" fixed="right">
+            <template #default="{ row }">
+              <el-button type="primary" link @click="previewAttachment(row)">预览</el-button>
+            </template>
+          </el-table-column>
         </el-table>
       </div>
 
+    <el-dialog v-model="previewDialogVisible" :title="previewTitle" width="90%" top="5vh" destroy-on-close>
+      <iframe :src="previewUrl" style="width:100%;height:75vh;border:none;border-radius:4px" />
+    </el-dialog>
+
       <h3 class="section-title">最近审计</h3>
       <el-table v-loading="auditLoading" :data="auditRows" border stripe size="small" style="width: 100%">
         <el-table-column label="时间" width="180">
@@ -169,6 +178,15 @@ const auditRows = ref([]);
 
 const attachments = ref([]);
 const uploading = ref(false);
+const previewDialogVisible = ref(false);
+const previewUrl = ref("");
+const previewTitle = ref("");
+
+function previewAttachment(row) {
+  previewTitle.value = row.fileName || "预览";
+  previewUrl.value = `${window.location.origin}/api/v1/preview/${row.id}`;
+  previewDialogVisible.value = true;
+}
 
 const lineDialogVisible = ref(false);
 const lineEditingId = ref(null);
@@ -307,8 +325,8 @@ function formatAuditTime(row) {
 async function loadNameMaps() {
   try {
     const [cRes, pRes] = await Promise.all([
-      listCustomers({ page: 0, size: 500 }),
-      listProjects({ page: 0, size: 500 }),
+      listCustomers({ page: 0, size: 200 }),
+      listProjects({ page: 0, size: 200 }),
     ]);
     const cBody = cRes.data && typeof cRes.data === "object" ? cRes.data : {};
     const pBody = pRes.data && typeof pRes.data === "object" ? pRes.data : {};