In this paper, the intelligent car is a control system that uses the 16-bit Freescale microcontroller MC9S12XS128 as CPU, and utilizes the CMOS camera as the sensor to collect the image information in track for path recognition. With debugging problem of complicated parameters for intelligent car, we demonstrated how to use the TFT color screen in both hardware and software, firstly. And then the handheld TFT color screen that is applied in path recognition, as well as the interactive interface, is illustrated in detail. The display of color screen contains a black line extracted from path, the threshold, moving images and static images, so it is easy to debug and analyze the image in a short period of time.