In order to solve the problem that local specular reflection is easy to occur during the measurement of objects with strong reflection surface, which affects the measurement accuracy. The digital micro mirror is added to the structural light measurement optical path and the measurement system is designed and built, including the digital micro mirror, CCD camera, projector and other devices. The matching of the system, the parameter calibration of camera and projector and the phase calculation are completed. The coordinate mapping relationship between the digital micromirror device unit and the camera pixel unit is established by using the sparrow search algorithm to optimize the BP neural network. The mapping error is 0. 583 pixels. An adaptive mask generation method based on PID controller is proposed, and the measurement experiment of the measure block with strong reflective surface is carried out. The experiment shows that the method can effectively reduce the gray level of the overexposed area, and achieve high dynamic range imaging. The proposed method can provide theoretical support for the three-dimensional measurement of strongly reflective surfaces.