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In order to meet the requirement for beach monitoring system, multi-path routing LHMR algorithm is designed to maximize network life. In the monitoring system with heterogeneous sensor network, LHMR algorithm consists of three parts: routing path creation, data transmission and routing path maintenance. Hop size is considered as one factor to decide the probability of path selection for data transmission. Simulation results show that LHMR algorithm can further reduce nodes' burning energy, prolong network lifetime.