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In order to solve the problems of unsatisfactory noise control, low current and voltage sampling accuracy and inaccurate fault detection in the traditional motor speed control system, an adaptive speed control system of asynchronous induction motor is designed. DSP-LF2407 is used as the hardware of the system main control chip, through optimizing the power circuit and power driving circuit, strengthen the noise control of hardware access; high precision sampling resistance, RC filter was applied to voltage signal, according to the characteristics of FAULT pin level fault in the system will be pulled low, current and voltage acquisition and improve the system software the accuracy of fault detection. Through the optimization of hardware and software, the design of asynchronous induction motor speed adaptive control system is realized. The experimental results show that the system has good noise control effect, high accuracy of current and voltage and high accuracy of fault detection.