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A complex surface detection method based on numerical simulation, array pasting, iterative method to establish coordinate system and improved least square method is proposed. The six-point iterative method is given to establish the algorithmic steps of the complex surface detection coordinate system. Then the 3-2-1 method is used to create the coordinate system. This paper proposes the method of array sticking and other methods to detect the point quickly and detect the complex surface. The improved Least Square Method proposed in this paper is used for computer data processing. The detection method in this paper effectively overcomes the shortcomings of the probe when the traditional method is used for measuring, and it has the disadvantages of multiple detection items and low detection efficiency, which can effectively improve the accuracy of complex surface detection and shorten the detection time. Through multiple tests and analysis, the results show that the proposed method is easy to program, the measurement is rapid, and the measurement results are accurate and reliable. With this method, we can solve the short board in the detection industry and related personnel in the three-dimensional detection, improve the detection efficiency and ability to solve problems.