Abstract: The performance of the target parameters estimation is greatly affected by the auto-correlation and cross-correlation of the multiple transmit waveforms. However, for bistatic multi-input multi-output (MIMO) radar, the orthogonal multiple waveforms are usually difficult to obtain. In order to solve this problem, a waveforms de-correlation algorithm is presented in this paper, which decorrelates the correlation through matrix decomposition followed by iteration. By the joint direction of departure (DOD) and direction of arrival (DOA) estimation, the simulation and performance analysis show the effectiveness and validity of the proposed algorithm.