In order to solve the beamforming problem of meter-wave OFDM-MIMO (orthogonal frequency division multiplexing-multiple input multiple output) radar, a signal model of frequency division multiplexed MIMO radar array under meter-wave conditions was established, and a theoretical framework for quantitative analysis of multipath characteristics of this system was derived theoretically. The direct-wave and multipath echo models, as well as the closed-form expression of the gain of the joint transmitter-receive bi-directional pattern were derived. A multipath suppression algorithm with range-angle two-dimensional resolution based on the bi-path pattern of a meter-wave OFDM-MIMO radar array was proposed. The proposed method can effectively suppress the multipath echo in the normal direction of the array, and also effectively suppress the periodic loss of the output fresh dryness ratio, and the inhibition ability is further improved with the increase of the frequency offset bandwidth.