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Environment physical parameters about the energy efficiency status in building can be monitored with wireless sensor network with mobile node. With the non-continuous features of monitoring area in space and time, sweep coverage in wireless sensor networks is presented in this paper. To plan routes for each mobile node for sweep coverage, gravitation potential filed based moving strategy in sweep coverage is given in this paper too. To calculate the gravitation between interesting point and mobile node, dynamic mass of interesting point is introduced as the measurement for the urgent grade of interesting point. Experiment results shows that the moving strategy for sweep coverage based on gravitation potential filed can plan routes for mobile node in sweep coverage effectively.