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Hello Steveguo!
There maybe 2 points:
1) You haven't uploaded .htaccess file in the root of UNA directory. You may get it from here https://github.com/unaio/una/blob/master/.htaccess
2) You server hasn't the installed modrewrite module which is one of UNA's requirements. So, in this case, you need to contact with your hosting support to install / enable it.