diff --git a/lib/validator.js b/lib/validator.js
index 37ff3df..6f4b234 100644
--- a/lib/validator.js
+++ b/lib/validator.js
@@ -173,6 +173,8 @@ var EXTENDED_COLOR_KEYWORDS = {
 
 var LENGTH_REGEXP = /^[-+]?\d*\.?\d+(\S*)$/
 var SUPPORT_CSS_UNIT = ['px', 'pt', 'wx']
+var SUPPORT_CSS_ENV = ['env(safe-area-inset-top)', 'env(safe-area-inset-bottom)', 'env(safe-area-inset-left)', "env(safe-area-inset-right)"]
+
 
 var ANYTHING_VALIDATOR = function ANYTHING_VALIDATOR(v) {
   return { value: v }
@@ -190,6 +192,11 @@ var ANYTHING_VALIDATOR = function ANYTHING_VALIDATOR(v) {
  */
 var LENGTH_VALIDATOR = function LENGTH_VALIDATOR(v) {
   v = (v || '').toString()
+
+  if (SUPPORT_CSS_ENV.indexOf(v) > -1) {
+    return {value: v};
+  }
+
   var match = v.match(LENGTH_REGEXP)
 
   if (match) {