diff --git a/src/core/constant/var.js b/src/core/constant/var.js
index a109324c0..8f3a5f259 100644
--- a/src/core/constant/var.js
+++ b/src/core/constant/var.js
@@ -142,10 +142,10 @@ export function pixFormat(pix, border) {
     if (!isNumber(pix)) {
         return pix;
     }
-    if (pixUnit === "px") {
-        return (pix / pixRatio - (border || 0)) + pixUnit;
+    if (BI.pixUnit === "px") {
+        return (pix / BI.pixRatio - (border || 0)) + BI.pixUnit;
     }
-    const length = pix / pixRatio + pixUnit;
+    const length = pix / BI.pixRatio + BI.pixUnit;
     if (border > 0) {
         return `calc(${length} - ${`${border}px`})`;
     }
@@ -157,11 +157,11 @@ export function toPix(pix, border) {
     if (!isNumber(pix)) {
         return pix;
     }
-    if (pixUnit === "px") {
-        return pix - (border || 0) * pixRatio;
+    if (BI.pixUnit === "px") {
+        return pix - (border || 0) * BI.pixRatio;
     }
     if (border > 0) {
-        return `calc(${pix / pixRatio + pixUnit} - ${`${border}px`})`;
+        return `calc(${pix / BI.pixRatio + BI.pixUnit} - ${`${border}px`})`;
     }
     
     return pix;