MT release shared QT, use it will crash

I compile QT5.7 shared release mode under windows vs2015 with MT switch( modify QT\src\Win32\qtbase\mkspecs\common\msvc-desktop.conf ).
when I use compiled dlls and libs in my program release mode , the program runs ok, but when quit, exist main function, it will crash.Not only my test program crash, QT own program crash too, for example, designer.exe, it runs OK too, but crash when quit.