Distance measurement technology based on RSSI is a low-cost and low complexity distance measurement technology.It is widely applied in the range-based localization of the wireless sensor networks.Because of non line of sight and multipath transmission effects under the indoor environment

the ranging error is relatively large.In the method of eliminating ranging error

linear regression analysis is used on the RF signal transmission parameters A and n to optimize the constants and obtains parameters to meet specific environment.Two kinds of filtering model for filtering collected RSSI is proposed.The experimental results show that ranging error has been significantly improved through parameter optimization and filtering processing.