In the research of bullet flight attitude in modern launch orbits space, the transient attitude of the bullet is captured by several groups of shadow cameras. By image processing and calculation, the whole flight data can be known. In order to acquire accurate measured data, it is critical to calibrate spatial geometrical coordinates. Considering the low precision and poor calibration coherence of traditional grid calibration system, a new type of shadow camera calibration system based on positive sensitive detector and optical lever is researched. The principle background, components and adjusting means are illustrated, and the experimental consequence is analyzed. The results indicate that the calibration accuracy of angle is better than 10″, and the measurement error is less than 0.06 mm. The multi-group cameras′ calibration coherence error is less than 0.1 mm in use with this new system.