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In order to accomplish the localization for mobile nodes in underwater Sensor Networks, and solve the localization error of the traditional nodes localization method when applied to the compound ocean monitoring without people guarding, a sensor node localization method based on GM (1,1) model and improved Chan is proposed. Firstly, the GM (1,1) model is used to predict the data sensed by the node in the next time, and the prediction value is compared with the data sensed by the node, so they are compared to justify the node is at the normal state. Then, the improved Chan algorithm is used to localize the mobile sensor node with the normal state, so the localization accuracy of the underwater sensor node can be improved. The simulation experiment is implemented in the Matlab, The experiment result shows the method in this paper always has the lower localization error when appears the increment of the sensor node moving speed, communication radius and anchor node density, so it has big priority.