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In order to meet the practical application needs, a three phase DC brushless motor intelligent control system based on SPANSION MB9BF121K single chip is designed. After the detailed introduction of the system design scheme, the hardware section focuses on the design of the motor drive module, the signal detection module and the current acquisition and protection circuit. The software section first introduces the structure of the system structure and flow chart, the commutation process of the motor is emphasized, a data method based on hybrid velocity measurement and recursive mean and RC filtering is analyzed, section adaptive PID speed control is also introduced. In no-load test, it takes about 0.8s to speed up from 250 r/min to 4000 r/min and to speed down from 250 r/min to 250 r/min. In load test, the speed of the motor is stabilized to the original speed after about 1.5s when the load is applied and the load is cancelled.