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In this paper, The Monte Carlo localization algorithm based on RSS is proposed, which calibrate the weights between mobile node and each anchor nodes by using the distance between anchor nodes and mobile nodes measured RSS values. This method avoids the filter conditions of MCL method which makes it impossible to get enough valid samples and resample to bring a large number of calculations. Simulation shows that this method reduces the probability of weight coefficients degeneracy and the sample size is decreased. It improved the calculation efficiency and the localization accuracy of mobile nodes.