Open Access (OA) is developing very fast in recent years. It can help to stimulate free scientific achievements propagation via Internet and promotes academic exchange and fast publishing in an efficient and cheap way. Here, we proposed a construction scheme of our NSFC open access library which is under development. We propose the overall architecture for OA library. Then, we present detailed design from upper layer OA webpage to the mid layer some key function modules. Finally, the bottom layer raw data acquisition modules are explained with illustrative figures and table.