Owing to their simple structure and stability, AC induction motors have been widely used in many fields. With the development of electronic devices, variable-frequency speed regulation system of the induction motor is widely used. This paper introduces an ARM chip controller LM3S818 from Texas Instruments in detail as a microprocessor of the variable frequency speed regulation system for asynchronous motor. The main circuit of AC-DC-AC Variable frequency way is adopted and the control system is based on Space Vector Pulse Width Module. The hardware structure and the design of software both are presented. And experimental results show the good performance in different frequency.