Abstract: The existing OpenCV template matching can realize the positioning of the screen printer，but the template image can not get the matching result in the search chart，and the positioning actuator uses the traditional direct value transfer method causing the positioning actuator stuck． In order to solve the above two problems，this paper proposes a template matching method based on similarity． It is verified that the method can solve the problem that the template image can not get the matching result in the search graph． The experimental results show that the similarity recognition method based on similarity is more than 91%，and the average time is less than 250 ms． A speed-matching movement method has also been proposed． This method solves the problem of the positioning actuator performing the stalling，the experimental results show that the speed-matching movement method does not exhibit a stalling phenomenon during 250 operations．

Key words: screen printing machine, OpenCV, template matching, visual positioning, similarity