Abstract: In order to reduce the energy consumption in D2D communication network, an optimization scheme of D2D caching network is designed. Firstly, the delay and energy consumption of wireless network in the initial state are calculated. Then, considering D2D communication and traversing all the cached files, the users with space of improvement in delay and energy consumption are selected for optimization, and the optimal combination of users and files is obtained. Finally, on the premise that communication will not be disturbed by noise and in accordance with the residual power of user equipment, the transmitting power of user is reduced as much as possible, and refreshed before each communication and stored in the matrix of base station as the initial value. The simulation results show that the dynamic energy consumption cache scheme can obtain the optimal average energy consumption in D2D communication network, and after the energy consumption improvement, the system delay is basically the same as the original algorithm, which shows that the buffer optimization scheme effectively improves the perfor-mance of D2D communication network.