Abstract: We introduce the working principle of normally closed anti-tram running device in inclined shaft of coal mine, according to the maximum protection distance of anti-tram running device and combined with the analysis of train going up and down the well under the most unfavorable condition, we propose the calculating formula of anti-tram running device for its maximum distance. Through detailed analysis of anti-tram running device setting principles by design example, we summarize the main problems of device design at present and propose solutions.