Abstract: A scheme is proposed to calibrate the sensor node coordinate with the bearing measurement of a mobile anchor node in wireless sensor networks.For the cases that the location of the mobile anchor node is known,uncertain and unknown, a method to estimate the sensor node location is firstly presented;the node localization error is then theoretically analyzed; and a method to calibrate the sensor node coordinates in different coordinate axes is lastly proposed.Simulation results show that the proposed scheme efficiently avoids errors in calibration and improves the sensor node position accuracy.