Multi-CPU system of easy expansion

The present invention discloses an extendible multiple CPU system, including mother plate and several CPU modules. The described every CPU module is equipped with a fastening board interface. It is characterized by that said several CPU modules are formed into a laminated type structure by adopting layer-by-layer fastening connection mode from top to bottom, the lowest CPU module is fastening-connected on the mother plate. The communication between the described several CPU modules can be coordinated by means of setting route.