In order to improve the measurement precision of the triangulation measurement system based on Synchronized Scanner, the system’s parameters are analyzed. First, the system’s principle and parameters are described briefly. Then, according to the system’s parameters, the influence on the precision from the position errors and angle errors of M1, M2, M3, M4, CCD and the lens’s position error and M3’s thick error are analyzed. Based on the influence on measurement precision, the parameters are ranked in the aspect of importance. Finally, the system is constructed and the 3D results are acquired.