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In order to realize the multiple-coverage in monitor area, a heterogeneous sensor node method with K-coverage guarantee was proposed in this paper. Firstly, remain energy and sensor ability factors were added to the traditional sensor model to get the improved sensor model, and the goal function was designed to satisfy the coverage constraint. Then the improved immune gene algorism was used to schedule the sensor node. Finally, the specific algorism for heterogeneous sensor node scheduling was given based on improved immune gene algorism. The simulation shows that our method can realize the sensor node scheduling in monitoring area with K-Coverage, and the number of live nodes was more than 7% compared with other methods, so it has the longer life circle and less energy consumption.