The invention relates to a backlight module assembly method, a backlight module and a display. The backlight module assembly method includes steps that paving a transparent diffusion film on the surface of a display panel; connecting the side of the diffusion film opposite to the display panel with a rubber frame of the backlight module. The method is capable of improving the backlight module and display panel assembly stability; by means of the method, the stability of the backlight module assembled with the display panel is high. The display with the backlight module is good in structure stability, and the image display quality is good.