diff --git a/docs/zh-CN/concepts/data-mapping.md b/docs/zh-CN/concepts/data-mapping.md
index 3b0ff8d8d..7e2dc7451 100755
--- a/docs/zh-CN/concepts/data-mapping.md
+++ b/docs/zh-CN/concepts/data-mapping.md
@@ -1306,6 +1306,43 @@ ${xxx | bytes}
 }
 ```
 
+##### 指定换算间隔参数
+
+```
+${xxx | bytes[:step]}
+```
+
+```schema
+{
+  "type": "page",
+  "data": {
+    "bytes1": 2333,
+    "bytes2": 2333333,
+    "bytes3": 2333333333
+  },
+  "body": [
+    {
+        "type": "tpl",
+        "tpl": "bytes1 is ${bytes1|bytes:1024}"
+    },
+    {
+        "type": "divider"
+    },
+    {
+        "type": "tpl",
+        "tpl": "bytes2 is ${bytes2|bytes:1024}"
+    },
+    {
+        "type": "divider"
+    },
+    {
+        "type": "tpl",
+        "tpl": "bytes3 is ${bytes3|bytes:1024}"
+    }
+  ]
+}
+```
+
 ### asArray
 
 将数据包成数组
diff --git a/packages/amis-core/__tests__/filter.test.ts b/packages/amis-core/__tests__/filter.test.ts
index 217c19142..4c04c553d 100644
--- a/packages/amis-core/__tests__/filter.test.ts
+++ b/packages/amis-core/__tests__/filter.test.ts
@@ -132,6 +132,15 @@ test(`filter:bytes`, () => {
     })
   ).toBe('234 KB');
 });
+
+test(`filter:bytes:step`, () => {
+  expect(
+    resolveVariableAndFilter('${a|bytes:1024}', {
+      a: 234343
+    })
+  ).toBe('229 KB');
+});
+
 test(`filter:round`, () => {
   expect(
     resolveVariableAndFilter('${a|round}', {