diff --git a/backend/package.json b/backend/package.json
index 0733dd0..6e3112d 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.14.81",
+  "version": "2.14.82",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and ShadowRocket.",
   "main": "src/main.js",
   "scripts": {
diff --git a/backend/src/core/proxy-utils/processors/index.js b/backend/src/core/proxy-utils/processors/index.js
index 3e3c2c0..fa2a8d4 100644
--- a/backend/src/core/proxy-utils/processors/index.js
+++ b/backend/src/core/proxy-utils/processors/index.js
@@ -8,6 +8,7 @@ import $ from '@/core/app';
 import { hex_md5 } from '@/vendor/md5';
 import { ProxyUtils } from '@/core/proxy-utils';
 import env from '@/utils/env';
+import { getFlowHeaders, parseFlowHeaders, flowTransfer } from '@/utils/flow';
 
 /**
  The rule "(name CONTAINS "🇨🇳") AND (port IN [80, 443])" can be expressed as follows:
@@ -668,6 +669,7 @@ function removeFlag(str) {
 }
 
 function createDynamicFunction(name, script, $arguments) {
+    const flowUtils = { getFlowHeaders, parseFlowHeaders, flowTransfer };
     if ($.env.isLoon) {
         return new Function(
             '$arguments',
@@ -678,6 +680,7 @@ function createDynamicFunction(name, script, $arguments) {
             '$notification',
             'ProxyUtils',
             'scriptResourceCache',
+            'flowUtils',
             `${script}\n return ${name}`,
         )(
             $arguments,
@@ -691,6 +694,7 @@ function createDynamicFunction(name, script, $arguments) {
             $notification,
             ProxyUtils,
             scriptResourceCache,
+            flowUtils,
         );
     } else {
         return new Function(
@@ -699,7 +703,9 @@ function createDynamicFunction(name, script, $arguments) {
             'lodash',
             'ProxyUtils',
             'scriptResourceCache',
+            'flowUtils',
+
             `${script}\n return ${name}`,
-        )($arguments, $, lodash, ProxyUtils, scriptResourceCache);
+        )($arguments, $, lodash, ProxyUtils, scriptResourceCache, flowUtils);
     }
 }
diff --git a/backend/src/restful/subscriptions.js b/backend/src/restful/subscriptions.js
index 4ad88c1..17d4f53 100644
--- a/backend/src/restful/subscriptions.js
+++ b/backend/src/restful/subscriptions.js
@@ -6,7 +6,7 @@ import {
 } from './errors';
 import { deleteByName, findByName, updateByName } from '@/utils/database';
 import { SUBS_KEY, COLLECTIONS_KEY, ARTIFACTS_KEY } from '@/constants';
-import { getFlowHeaders } from '@/utils/flow';
+import { getFlowHeaders, parseFlowHeaders } from '@/utils/flow';
 import { success, failed } from './response';
 import $ from '@/core/app';
 
@@ -68,20 +68,7 @@ async function getFlowInfo(req, res) {
             return;
         }
 
-        // unit is KB
-        const uploadMatch = flowHeaders.match(/upload=(-?)(\d+)/);
-        const upload = Number(uploadMatch[1] + uploadMatch[2]);
-
-        const downloadMatch = flowHeaders.match(/download=(-?)(\d+)/);
-        const download = Number(downloadMatch[1] + downloadMatch[2]);
-
-        const total = Number(flowHeaders.match(/total=(\d+)/)[1]);
-
-        // optional expire timestamp
-        const match = flowHeaders.match(/expire=(\d+)/);
-        const expires = match ? Number(match[1]) : undefined;
-
-        success(res, { expires, total, usage: { upload, download } });
+        success(res, parseFlowHeaders(flowHeaders));
     } catch (err) {
         failed(
             res,
diff --git a/backend/src/utils/flow.js b/backend/src/utils/flow.js
index 606aa24..b0cc8b9 100644
--- a/backend/src/utils/flow.js
+++ b/backend/src/utils/flow.js
@@ -13,3 +13,28 @@ export async function getFlowHeaders(url) {
     )[0];
     return headers[subkey];
 }
+export function parseFlowHeaders(flowHeaders) {
+    if (!flowHeaders) return;
+    // unit is KB
+    const uploadMatch = flowHeaders.match(/upload=(-?)(\d+)/);
+    const upload = Number(uploadMatch[1] + uploadMatch[2]);
+
+    const downloadMatch = flowHeaders.match(/download=(-?)(\d+)/);
+    const download = Number(downloadMatch[1] + downloadMatch[2]);
+
+    const total = Number(flowHeaders.match(/total=(\d+)/)[1]);
+
+    // optional expire timestamp
+    const match = flowHeaders.match(/expire=(\d+)/);
+    const expires = match ? Number(match[1]) : undefined;
+
+    return { expires, total, usage: { upload, download } };
+}
+export function flowTransfer(flow, unit = 'B') {
+    const unitList = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB'];
+    let unitIndex = unitList.indexOf(unit);
+
+    return flow < 1024
+        ? { value: flow.toFixed(1), unit: unit }
+        : flowTransfer(flow / 1024, unitList[++unitIndex]);
+}