Abstract: A method for joint direction of departure (DOD) and direction of arrival (DOA ) estimation using polynomial rooting for bistatic multiple input multiple output(MIMO) radar system is proposed in this paper.The method takes the special structure of the output of the entire matched filters at the receiver that enables decoupling the DOD and DOA estimation problem into two successive 1D azimuth angle estimation problems.As a result of onetoone correspondence between eigenvalues and eigenvectors， the DODs and DOAs of targets paired automatically and no need of 2D peak search of spatial spectrum.By concatenating the matched array data，it is equivalent to increase the number of virtual sensors and expand effective array aperture size.Therefore， the sources which could be detected and estimated increase in number，the angle estimation performance is further improved，the effectiverange for direction finding gets widened，and the presented method is much more robust to noise and/or array calibration error.Numerical simulation results verify the effectiveness and validity of the proposed method.