Abstract: The traditional delay-locked loop（DLL） is improved to meet the needs of tracking the ultra-wide band width（UWB） communication signals.By the adding two tracking controller,a UWB communication signal tracking algorithm was put forward.The phase discrimination characteristics,as well as the statistical characteristics of the discriminator output noise were theoretically analyzed.The simulation results on additive white Gauss noise（AWGN） channel are also presented.Results revealed that by properly choosing such parameters as t_DLL and η₁,the proposed tracking loop had better performances such as larger dynamic locking range and little tracking jitter.