In order to achieve the Omnidirectional mobile and obstacle avoidance of the platform,a mobile platform control system is designed.Using infrared sensor and the differential drive of brushless motor to achieve pathtracking,using ultrasonic sensor to achieve distance measure.According to the processing and analysis of the data which collected by the platform to achieve obstacle avoidance.The system also has a wireless control mode , which allowed operator to realize the direction control of the mobile platform by operate a joystick when the mobile platform meets the obstacle or driving in nontracking orbit. Experimental results show that the mobile platform can detect and correct aspect automatically and achieve collision free trave.