Heat dissipation system for computer CPU

The utility model discloses a heat dissipation system for computer CPU, including mainboard and the radiator fan of system, CPU set up in the middle part of mainboard, mainboard top are provided withthe aluminum alloy cover body, and the aluminum alloy cover body divide into superstructure and infrastructure through the horizontal separators at middle part, set up upper portion gas change chamberin the superstructure, it places room and lower part gas change chamber to be provided with CPU in the infrastructure, CPU's upper surface and be provided with the fin all around, the fin includes plate body and the fin of setting on the plate body with the CPU laminating, the fin gets into upper portion gas change chamber or lower part gas change chamber, upper portion gas change chamber with lower part gas change chamber be provided with the air current entry in the one side that is close to radiator fan, the opposite side is provided with airflow outlet, upper portion gas change chamber with lower part gas change c