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With regard to the disadvantages, such as insensitivity under the interference of highlights, the high requirements of the tracking line's chromatic aberration and line width, of the traditional tracking car, which is mainly based on reflected infrared sensors, this article proposes a control system design which uses Micro Control Unit as a controller, LDC1000 digital inductance converter and external coil as tracking sensor, combines opto-electronic testing velocity circuit, drive circuit and LCD display circuit, etc. Such control system could realize a stable running on a flat runway with a runway identification of a thin wire whose diameter is 0.9 mm. The control system has the function of detecting sheet metals on the runway while running, could realize the alarming and counting functions; and has the function of the real-time display of the car's running time, speed and distance. The experiment indicates that this system has the advantages like a high precision, a clear display and a stable performance, adopts the non-contact, non-magnet sensor technology and has a certain guiding significance to the design of the cars using conductor as tracking identifications.