In this paper,the error analysis of the three-dimensional measuremen t system of multi-channel structured light shows that the light intensity collected by the camera is affected by the crosstalk between channels and nonlinear response of projection and image acquisition devices.Based on the analysis of the influence of crosstalk and nonlinear error on the projection and acquisition of light intensity,a mathematical model of systematic error com pensation for camera acquisition of light intensity is proposed.The nonlinear response parame ters of each optical channel of the system are calculated according to the camera data of pro jecting 0－255gray-scale image to white plate,and the crosstalk coefficient of each channel is obtained by calculating the images when projecting the single color fringes to white plate. By building the error of the model,the nonlinear and crosstalk error are compensated at the sam e time.The experimental results show that after the correction by the error compensation mo del,the unwrapped phase difference can be reduced from 1.044rad to 0.121rad,and the measurement error can be reduced from 0.707mm to 0.058mm.Based on the system error analysis,the compensation mo del proposed in this paper can measure and compensate crosstalk and nonlinear error at the same time.It can effectively improves the measurement accuracy of the multiple optical channels s tructure light three-dimensional measurement system.