Method and system for assembling backlight module

A backlight module assembling method for assembling a backlight module of a luminous keyboard, the backlight module comprising a first coupled element and a second coupled element in a stack form, at least one of the first coupled element and the second coupled element is equipped with plural coupling objects, the first coupled element and the second coupled element being combined together through the plural coupling objects, the backlight module assembling method comprising steps of:

• (a) providing a positioning device, wherein after the first coupled element is aligned with a predetermined position of an assembling table surface through the positioning device, the first coupled element is placed on the predetermined position of the assembling table surface;
• and
• (b) allowing the first coupled element on the predetermined position of the assembling table surface to be adsorbed according to vacuum adsorption, so that the first coupled element is evenly fixed on the predetermined position of the assembling table surface, wherein after the first coupled element is evenly fixed on the predetermined position of the assembling table surface, the second coupled element is aligned with and placed on the first coupled element, so that the second coupled element and the first coupled element are combined together.