The main method of the attitude measurement is to get series of graphs for analyzing the changing attitude of the projectile by utilizing multiple shadowgraph-taking camera stations. However, the premise of accurate results is that feature points on graphs must match their spatial coordinates in a certain spatial coordinate. Aiming at this problem, we propose a method of calibrating the spatial coordinate coherence for the long distance and multiple shadowgraph-taking camera stations with position sensitive detector (PSD), and analyze the measurement accuracy and repeatability of this method. A system is developed to do some regular experiments. According to the results, the accuracy of this calibration method is superior to 0.1 mm.