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Mobile nodes in Ad hoc network are typically powered by batteries. Normally some nodes stop working when run out of energy, which influences the integral performance of the Ad hoc network, and will split the network in severe situation. Therefore it is extremely important to conserve the energy. The existing route protocol based on Dynamic Source Routing (DSR) suffers from the drawback of energy-consuming. For this purpose, this paper proposes a novel method of energy-conserving route protocol called NCE-DSR(Number of times nodes send Constraint Energy DSR). Based on DSR protocol, mark related to the number of times of sending message is added to the datagram for routing protocol. And the nodes with relatively more number of times of sending message are protected. Cost function for route is designed for route choice with reasonable energy allocation for the whole network. Experimental results demonstrate that the proposed method NCE-DSR achieves significant improvement over the previous one with longer network survival time.