The present invention provides a frame structure and its applied backlight module and a lcd, the frame includes a containing space surrounded by complex side walls to contain the backlight module, at least two supporting parts which are provided on the inner sides of at least two side walls of the complex side walls to place the liquid crystal display panel on it, and at least two gap parts whichare provided on the outer sides of the two walls. Thus, when the liquid crystal display panel is separated from the frame, the gap part catches the exposed edge of the liquid crystal display panel toprocess movement.