In recent years, there has been a growing interest in wireless sensor networks. Since the sensor nodes have limited available power, energy conservation is a critical issue in all researches about sensor networks. Developing a coverage control protocol to prolong networks life is one of the most important solutions. Based on analyzing the existing coverage control approaches and the features of heterogeneous sensor networks, we propose a Distributed coverage control Strategy based on Location information (DSL) for heterogeneous sensor networks. In DSL, each node calculates the coverage degree locally, and the node scheduling strategy is based on weak time synchronization scheme. Under the premise of guaranteeing nodes k-coverage precisely , DSL can make as more as possible nodes inactive. Simulation results demonstrate that our protocol can reduce the number of active nodes effectively while achieve the required coverage degree, balance the energy consumption and maintain long network lifetime.