Abstract: The nature of Open Access knowledge sharing mechanism is to build shared knowledge acquisition platform in the world and it aims to wipe out business monopoly of science information.This paper points out that the business monopoly of science information is the outcome of knowledge capitalization.But it is different from the reasonable secrecy of science knowledge under market model.And the open requirements of Open Access are not completely equal to the traditional communism specification.There difference between them are value judgment,realization path,institution guarantee and constraint objects.