This paper proposes a multimedia data storage and sharing scheme based on the network environment. The system adopts MAC data storage and sharing method. The whole structure and function modules of the system are designed based on the actual operation process of university multimedia teaching resources. The structure of functional time series and use cases is studied. The main functions of the software are designed. This project proposes the method of first and second differentiation to realize the boundary detection of multimedia information. The correctness of each boundary point and the interaction between them are determined by the first and second differential curves. Then the boundary fuzzy operator is obtained through Gaussian distribution to identify the boundary points of all kinds of information. The feasibility of this method is verified by functional test. Compared with other algorithms, the proposed algorithm has higher precision and better effect. It has great promotion value.