Abstract: To improve the tracking accuracy of moving objects in radio tomographic imaging (RTI) and reduce the multipath effect, exponential moving average (EMA) was used as the parameter to evaluate the signal changes in RTI. Long-term EMA was used as an alternative benchmark to avoid the measurement of the background information in advance for the area. Two single-moving person localization experiments were performed in outdoor through walls and indoor multipath environments. Compared with SRTI and KRTI, results show that the RTI method based on EMA can obtain better localization accuracy without obvious increasing of time consuming.