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As a multimedia information acquisition and processing method, wireless multimedia sensor network (WMSN) has great application potential in military civilian. Compared with traditional wireless sensor network, the routing design of WMSN should obtain more attention on the quality of transmission. This paper proposes a reliable routing based on energy prediction (REP), which includes energy prediction and power allocation mechanism. The introduced prediction mechanism makes the sensor nodes predict the remaining energy of other nodes, which dramatically reduces the overall information needed for balancing energy. based on the predicted result, REP can dynamically balance the energy consumption of nodes by power allocation. The simulation results prove the efficiency on energy equilibrium and reliability of the proposed REP routing.