The accuracy of projected patterning is seriously influenced by several problems in practice, such as tailing, missing and corner deviations. In order to solve the above mentioned problem based on the self-developed laser scanning projection set-up, the causes of tailing, missing and corner deviation are theoretically analyzed, then, the correction method of projection patterning deviation is studied based on time-compensated technology. Furthermore, the relationship between compensation time and sampling rate is obtained, and the mathematical model between compensation time and angle of projected patterning is established. Finally, the studied method is applied to the self-developed set-up of laser scanning projection, and the actual projected patterning are compared with the patterning which is projected by the FARO laser scanning projection system. The results show that the method can effectively eliminates the tailing and missing deviations, can compensate the corner deviation satisfactorily when projected checkerboard patterning with 5 rows and 5 columns. Compared the projected patterning before and after compensation for deviation, the accuracy of projection patterning is better than 0.5 mm. The studied method can improve accuracy of projected patterning significantly when applied to the self-developed set-up of laser scanning projection. Moreover, the studied method has good value for practical application.