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With the acceleration of urbanization developing in our country, urban traffic convenience and quickness has become an important criterion for urban development. Because of frequent start stop movement and high efficiency, city rail vehicle door has high request in safety and beauty. For a long time, there’s no simple, rapid and economic method for surface profile measurement during the subway doors production process. According to subway door characteristic and detection requirement, the paper designed an automatic detection device based on relative coordinate from the economy and feasibility.The paper discussed four methods of surface profile measurement, advantages and disadvantages, on the basis of this, it continued analyzing the subway door’s detection request, proposed the idea of one-dimension measurement instead of three-dimensional measurement, and finished the overall scheme design of the surface profile detection device. Then, it completed mechanical system design, control module design, measurement modules design and software design, and explained detailedly the data processing method and procedure.Based on the structure of the system, the paper detailedly discussed the selection of sensors, installation and adjustment way and the drive control principle of three axes. According to precision requirements of the subway door detection device, it formulated precision design and finished the error distribution, in the end, it did uncertainty evaluation on measurement results.Finally, the paper made up the experimental platform, and finished the experiment and data processing. The experiment result showed that the detection system was feasible.
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