According to different signal of sensors

intelligent car controls its azimuth and speed following certain rules

can realize autonomous navigation. Successful obstacles avoidance is one of the key question to enhance the independent ability of intelligent car in unstructured environment. For the purpose of autonomous obstacle avoidance

presents an algorithm based on multi-ultrasonic wave sensor for information processing

this algorithm through metrical datas of multi-ultrasonic wave sensor

according to processing result

determine safety zone of the car movement space area. Experimental results show that the security zones obtained by this method is reliable

and it is able to provide effective information for obstacles avoidance.