Abstract: In the multiple input multiple output (MIMO) radar, aiming at the problem that the signal changes caused by moving targets are easily affected by multipath effect and clutter environment, an optimization scheme based on time reversal is proposed. Firstly, the space-time focusing property of time reversal is used to reduce the influence of multipath effect on the target signal, and the signal energy generated by the moving target is focused, which is not easy to be submerged in the clutter environment; secondly, the detection algorithm is designed by the Neyman Pearson criterion and the approximate calculation formula of de-tection probability is calculated; finally, the simulation results show that the signal-to-noise ratio is the same in the clutter en-vironment The proposed scheme has better performance than the traditional MIMO detection methods.