Abstract: Due to the complexity of the design and analysis on phased array microstrip antennas,a new method is put forward in the paper.The model is constructed by using finite-different time-domain(FDTD) method,and the data are obtained with software Empire.Combined with the linear array theory and the transmission line theory,the relevant formulas are deduced and the data are processed with Matlab.A linear array consisting of seven phased microstrip patch cells is designed by the method,and some parameters such as dynamic reflection and radiation pattern etc.are analyzed after optimizing.The analysis results are compared with simulation curves through a practical sample and the accuracy of this analytical method is showed.Our study shows that the method is useful for rapid designing and analyzing phased array microstrip antennas.