when I use havij to inject a bug .username and email are well ,only password like this:

=wu?E欛
=／?
=?80+
=GN皮Y"
=G皭斏
=衴屧D橉
=wz拷&$

what wrong?

Well two things are clear.
1. If this is an error based vul. Then its a programming glitch that prevents the escape of password.

2. Else it can be due to encoding problem. try to get the pass in hex() and then unhex it manually or you may try md5() also.

Strong Advice: Dont use automated tools. They are noisy, detectable and try to learn doing it on your own.

Hackers create tools - Tools don't create hacker.