Great concern has given to mobile location services in mobile communication system for its importance.And OFDM as one of the core technologies of the next wireless communication system is widely applied in digital audio broadcasting（DAB）

digital video broadcasting（DVB）and WLAN for its advantage such as the ability to oppose multi-path interference and high spectrum utilization.An efficient estimation of timing and ranging improved algorithm is proposed by using short CP correlation based classical ML algorithm and ensemble correlation timing estimation algorithm.Simulation result conducted in both AWGN channel and multi-path fading channel shows that the improved algorithm is characterized by better performance.