This article gives a method of multiprocessor system realization.First

all characteristic of present methods are compared

and then it gives out a design method of selfdefined parallel bus based on overall point of view.This method realizes communication of multiprocessor using the shared mail box structure and competed bus arbitration.The key technique shared mail box structure and competed bus arbitration.The key technique shared RAM board is emphasized

which makes the device lower price

smaller bulk

and more practical.