Abstract: At present most navigation information on the pavement on which a smart car is traveling is acquired by camera. A navigation module is therefore developed, for which how the CCD video signal is acquired and processed are described. Considering the effect of the change of ambient light on the navigation system of the car, an image processing algorithm with adaptive dynamic threshold is proposed to track the change of ambient light and provide an anti-jamming way for the navigation system with short operating time required. The problem that a running car deviates from planned route because of changes of ambient light and raceway can thus be solved efficiently. As a result of test and actual competition, the navigation system showed its intelligence and anti-jamming ability, i.e., the navigation module is effective.