Abstract: As to the scientific resources distribution and shared use on the large-sized scientific instrumentation, researchers and policy makers generally think the inefficiency of shared use and repeat purchase as the mail problem. According to that they formulate policies to correct on those problems. But the empirical and theoretical research on the causality of the inefficiency of shared use and repeat purchase are quite rare. This article focuses on the resources distribution of large-sized scientific instrumentation based on empirical evidence, and then uses queue theory model to analysis the shared use phenomenon. Finally we conclude the reason for the inefficiency of shared use and repeat purchase, and suggest the recommendation to policy makers.