This paper presents an angle estimation method for multitargets in bistatic MIMO radar system. It can estimate DOD and DOA with single snapshot in time domain. By exploiting transmisson diversity smoothing to the equivalent receiving array data, the rank of the auto-covariance matrix of the multitargets scatters is recovered, which make DOA estimation go well. Similarly, receiving diversity smoothing to the equivalent transmitting array data is implemented to facilitate the DOD estimation. A matching method for the two kinds of angle based on the maximum likelihood principle is employed. In this way, only one snapshot of echo data decorrelates the coherence among the multitargets scatters successfully. In addition, the method is not limited to any certain array shape. Numerical results are presented to demonstrate the effectiveness of the method.