After disaster, wireless terminals (WTs) in disaster-affected areas seek for an energy efﬁcient way to communicate with the outside world, typically by sending their data to a nearby undamaged base station. To avoid the signiﬁcantly high energy consumption of multi-hop D2D communications from WTs to the undamaged base station, an unmanned aerial vehicle (UAV) is launched from the base station to collect data. To ensure the UAV can get back to the base station, the path length of UAV should be shortened through not visiting some WTs, which can transmit their data indirectly to the UAV through few hops. Aiming at decreasing the total energy consumption of WTs and with the restraint of the path length limitation of the UAV, a novel UAV-aided data collection method, ECO-UDC, including WT cooperation and UAV path planning is introduced. The performance of the proposed method was proved by extensive simulations, results of which demonstrate that ECO-UDC can reduce the energy consumption of WTs by approximately 30% -40% compared to the benchmark scheme.