So here's the version of my software
Unity 5.1.3 (32-bit) - as I follow the forum and got the answer that Vuforia 5 doesn't support on Unity 64 bit yet
Vuforia 5.0.10 - the latest version
here are my steps
1.Build a new project
2.import Vuforia unity package
3.switch to IOS platform
4.Export to empty folder
5.try to open the .xcodeproj file with Mac
then It gives me the message "xcodeproj cannot be opened because the project file cannot be parsed"
I guess this must be a stupid rookie mistake I make
this is my first time export to IOS though
thanks! you are my hero!!