diff --git a/packages/fineui/src/bundle.js b/packages/fineui/src/bundle.js
index 92ba6cfcf..7d9f259d1 100644
--- a/packages/fineui/src/bundle.js
+++ b/packages/fineui/src/bundle.js
@@ -1,6 +1,7 @@
 import * as fuiExport from "./index";
 import * as injectFn from "@/core/5.inject";
 import { _global } from "@/core/0.foundation";
+import {_defineVarProperties} from "@/core/constant/writable.var";
 
 _global.BI = _global.BI || {};
 
@@ -14,7 +15,4 @@ Object.assign(_global, {
 
 Object.assign(_global.BI, fuiExport, injectFn);
 
-Object.defineProperty(_global.BI, "EVENT_BLUR", {
-    set: fuiExport.setEventBlur,
-    get: () => fuiExport.EVENT_BLUR
-});
+_defineVarProperties(_global.BI)
diff --git a/packages/fineui/src/core/constant/index.js b/packages/fineui/src/core/constant/index.js
index 205529687..34aa468c5 100644
--- a/packages/fineui/src/core/constant/index.js
+++ b/packages/fineui/src/core/constant/index.js
@@ -1,2 +1,3 @@
 export { Events } from "./events";
 export * from "./var";
+export * from "./writable.var"
diff --git a/packages/fineui/src/core/constant/var.js b/packages/fineui/src/core/constant/var.js
index 3dd6f1247..bf1c68e10 100644
--- a/packages/fineui/src/core/constant/var.js
+++ b/packages/fineui/src/core/constant/var.js
@@ -1,24 +1,15 @@
 /**
  * 常量
  */
-import { isNumber } from "../2.base";
-import { Cache } from "../structure/cache";
-import { _global } from "../0.foundation";
-
-export let EVENT_BLUR = _global.localStorage ? Cache.getItem("event.blur", {typeConversion: true, defaultValue: true}) : true;
-export const setEventBlur = (v) => { EVENT_BLUR = v, Cache.setItem("event.blur", v) };
 
 export const MAX = 0xfffffffffffffff;
 export const MIN = -0xfffffffffffffff;
-export const EVENT_RESPONSE_TIME = 200;
 export const zIndex_layer = 1e5;
 export const zIndex_popover = 1e6;
 export const zIndex_popup = 1e7;
 export const zIndex_masker = 1e8;
 export const zIndex_tip = 1e9;
 export const emptyStr = "";
-export const pixUnit = "px";
-export const pixRatio = 1;
 export const empty = null;
 export const Key = {
     48: "0",
@@ -138,45 +129,4 @@ export const VerticalAlign = {
     Bottom: "bottom",
     Stretch: "stretch",
 };
-export const StartOfWeek = 1;
-export const BlankSplitChar = "\u200b \u200b";
-
-// 一定返回最终的单位
-export let pixFormat = (pix, border) => {
-    if (!isNumber(pix)) {
-        return pix;
-    }
-    if (pixUnit === "px") {
-        return (pix / pixRatio - (border || 0)) + pixUnit;
-    }
-    const length = pix / pixRatio + pixUnit;
-    if (border > 0) {
-        return `calc(${length} - ${`${border}px`})`;
-    }
-    
-    return length;
-}
-
-export function setPixFormat(func) {
-    pixFormat = func;
-}
-
-export let toPix = (pix, border) => {
-    if (!isNumber(pix)) {
-        return pix;
-    }
-    if (pixUnit === "px") {
-        return pix - (border || 0) * pixRatio;
-    }
-    if (border > 0) {
-        return `calc(${pix / pixRatio + pixUnit} - ${`${border}px`})`;
-    }
-    
-    return pix;
-}
-
-export function setToPix(func) {
-    toPix = func;
-}
-
 export function emptyFn() {}
diff --git a/packages/fineui/src/core/constant/writable.var.js b/packages/fineui/src/core/constant/writable.var.js
new file mode 100644
index 000000000..63c363507
--- /dev/null
+++ b/packages/fineui/src/core/constant/writable.var.js
@@ -0,0 +1,139 @@
+/**
+ * 可写的常量
+ */
+import { isNumber } from "../2.base";
+import { _global } from "../0.foundation";
+import { Cache } from "../structure";
+
+const PropertyDescriptors = {};
+
+export let EVENT_RESPONSE_TIME = 200;
+PropertyDescriptors["EVENT_RESPONSE_TIME"] = {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+        return EVENT_RESPONSE_TIME;
+    },
+    set: function(newVal) {
+        EVENT_RESPONSE_TIME = newVal;
+    }
+};
+
+
+export let pixUnit = "px";
+PropertyDescriptors["pixUnit"] = {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+        return pixUnit;
+    },
+    set: function(newVal) {
+        pixUnit = newVal;
+    }
+};
+
+export let pixRatio = 1;
+PropertyDescriptors["pixRatio"] = {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+        return pixRatio;
+    },
+    set: function(newVal) {
+        pixRatio = newVal;
+    }
+};
+
+export let StartOfWeek = 1;
+PropertyDescriptors["StartOfWeek"] = {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+        return StartOfWeek;
+    },
+    set: function(newVal) {
+        StartOfWeek = newVal;
+    }
+};
+
+export let BlankSplitChar = "\u200b \u200b";
+PropertyDescriptors["BlankSplitChar"] = {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+        return BlankSplitChar;
+    },
+    set: function(newVal) {
+        BlankSplitChar = newVal;
+    }
+};
+
+
+// 一定返回最终的单位
+export function pixFormat(pix, border) {
+    if (!isNumber(pix)) {
+        return pix;
+    }
+    if (pixUnit === "px") {
+        return (pix / pixRatio - (border || 0)) + pixUnit;
+    }
+    const length = pix / pixRatio + pixUnit;
+    if (border > 0) {
+        return `calc(${length} - ${`${border}px`})`;
+    }
+
+    return length;
+}
+PropertyDescriptors["pixFormat"] = {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+        return pixFormat;
+    },
+    set: function(newVal) {
+        pixFormat = newVal;
+    }
+};
+
+
+export function toPix(pix, border) {
+    if (!isNumber(pix)) {
+        return pix;
+    }
+    if (pixUnit === "px") {
+        return pix - (border || 0) * pixRatio;
+    }
+    if (border > 0) {
+        return `calc(${pix / pixRatio + pixUnit} - ${`${border}px`})`;
+    }
+
+    return pix;
+}
+PropertyDescriptors["toPix"] = {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+        return toPix;
+    },
+    set: function(newVal) {
+        toPix = newVal;
+    }
+};
+
+
+export let EVENT_BLUR = _global.localStorage ? Cache.getItem("event.blur", {typeConversion: true, defaultValue: true}) : true;
+PropertyDescriptors["EVENT_BLUR"] = {
+    enumerable: true,
+    configurable: true,
+    get: function() {
+        return EVENT_BLUR;
+    },
+    set: function(newVal) {
+        EVENT_BLUR = newVal
+        Cache.setItem("event.blur", newVal)
+    }
+};
+
+export function _defineVarProperties(libName) {
+    Object.defineProperties(libName, PropertyDescriptors);
+}