The invention discloses a content distribution method based on D2D and service unloading, which is applied to a fifth-generation mobile communication system, and belongs to the field of wireless communication. The method comprises the following steps of (1) constructing a popular content set; (2) constructing a user preference vector; (3) constructing a user cluster preference vector; (4) randomlyselecting a user cluster; (5) constructing a trade-off model of an unloading rate and energy consumption; (6) distributing popular contents; (7) calculating remaining storage space size; (8) judgingwhether the remaining storage space size is larger than 0 or not; (9) selecting a to-be-distributed content cluster; (10) judging whether the content distribution of all user clusters is completed ornot; and (11) completing the content distribution of all users. Compared with the traditional content distribution method, the method has the advantages that the high service unloading rate of a basestation is guaranteed while the energy consumption is considered, and the user experience quality is improved.