Because of the different divergences is in slow and fast axes of laser diodes (LD) and the compress of the coupling structure, the pumped beam output from the coupling structure will be deteriorated. and its efficiency will be reduced. Whereas this problem can be well solved by adjusting the position and direction of laser diode arrays (LDA) in the stack. After ray tracing and analyzing of the output beam, the affection of laser diode stack (LDS) structure on the output beam distribution can be gotten. The project experiment test gets a good output spot and a coupling efficiency of up to 90%.