Abstract: In order to judge the fuze safe condition safely and reliably and to realize the automatic and precise judgment, it was confirmed that the key was the safety pellet state identification at first. Then the optimal projection and morphological technology was adopted to constitute identification arithmetic of safety pellet state on the basis of characters of part location, gray scale and conformation represented by some type inertia safety fuze X ray pictures. Then the arithmetic was programmed by C-language, and the man-machine interface was designed by C++ Builder. Thus the problem of inertia safety fuze safe condition automatic and precise judgment was solved.