Abstract: Most of previous conclusions on the target detection ability increase of phased array radars byutilizing the joint polarization-space-time processing methods were obtained under the environment of Gaussianclutters. The real clutter environments are much more complex than that showed by Gaussian clutter models. Bymeans of the theoretical analysis and the simulation experiments, the target detection ability of phased array radarwith the polarization-space-time generalized likelihood radio (PST-GLR) algorithm and joint polarizationzspace-time localize GLR (PSTL-GLR) algorithm are analyzed under the environment of non-Gaussian clutters.The results show that the PST-GLR algorithm is robust against non-Gaussian clutters, but it requires largenumbers of echo data to estimate the covariance matrix of clutters and noises in the process of target detection.Although PSTL-GLR algorithm requires less echo data in the process of target detection, its target detection abilitydegraded seriously so that it is invalidation under the environment of non-Gaussian clutters.