There are two keyframes ingframe01 / keyframe02 in the main second, where there is a button on each key frame, named btn_help, btn_help (Note that the name is the same); I add the following ACTION: _root on KeyFrame01 .BTN_HELP.ONRELEASE = Function () {_root.gotoandplay (1);} Also in keyframe01, add the same code, when debugging, everything is normal questions: When _root.btn_help.onrelease, how does Flash know? What about btn_help?