For structured light measurement system, parameter calibration is the key technique of measurement. However the accuracy of projector parameters calibration is low. A simple, convenient and accurate method is put forward, which is done by projecting circles pattern to a flat with circular signalized points. Fundamental corresponding relation is established between projector image and camera image based on projective transformation theory. After that accurate corresponding relation is established by using bivariate quartic function to fit and compensate error. It is obtained for the accurate projector image coordinates of circular signalized points on the flat. Then, projector calibration is accomplished. Simulation and experimental results demonstrate that the proposed method can get better precision, and experiments verify that the maximum value and efficient value of projector calibration error is less than 0.1 and 0.03 pixel respectively, and the system measurement precision is about 0.06 mm.