Aiming at the problems of startup delay and long time consuming of statistical task in μC/OS-III system, the μC/OS-III system is optimized based on MPC555 platform. The Tick method is used to solve the startup delay of μC/OS system, and the problem of long time consuming of statistical tasks is solved by eliminating task stack statistics. After using the Tick method, the startup time delay of the μ C/OS system is solved, and the time consumption of the statistical task is reduced as well. After the optimization, the system is more reliable.