Aiming at the problem that the radio tomographic image（RTI） localization system node deployment process requires much time and manpower to measure position of sensor node

a method based on probability density for RTI node self-localization is proposed.The method uses the probability density of the region as the weight

and calculates the weighted average of the region centroid as the position coordinate of the RTI node.The validity of the method is verified by field test.The probability density-based RTI node self-positioning method not only reduces the complexity of the original node self-localization algorithm and greatly improves the deployment efficiency of the RTI system

but also enhance the positioning precision.