As the @george2079 's [suggetion](http://mathematica.stackexchange.com/questions/111637/garbled-output-when-importing-a-vcf-file/111643?noredirect=1#comment303069_111643),I post my solution **from a friend** as an answer,but I'm sure there are more better method can do this.

    $Version

> "10.3.1 for Microsoft Windows (64-bit) (December 21, 2015)"


    string = First@Import["file address"];
    Rule @@@ Transpose@{Keys[string], 
       URLDecode[StringReplace[Values[string], "=" -> "%"], 
        CharacterEncoding -> "UTF-8"]}

> {NameLast->测试,FormattedName->测试,Phone->12345 678 9}