n order to increase the automatic cruise smart car'S speed, we raise the analog CCD camera, reduce its angle of depression, and build a high—speed AD converter circuit outside the micro—controller.In the driving part, we use the H—bridge driver circuit to drive the smart car forward and brake.The real—time speeds were obtained combining with speed encoder, and controlled by PD al—gorithm.In the turning parts, we improve servo mounting for vertical through heightening its position. The conclusions prove that the smart car get a greater foresight and a sensitive turning response.It can operate quickly and stably.