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This paper proposes a method of dual-function radar-communication sharing signal transmit-receive based on MIMO-OFDM (multiple input multiple output-orthogonal frequency division multiplexing). The signal model of MIMO-OFDM system and processing method of communication information modulation on OFDM radar signal in dual-function radar-communication system are analyzed. One can realize the transmitting and receiving of dual-function radar-communication signal by using MIMO beam-forming technique. The emission pattern which meets radar target detection and communication directions is designed to achieve the transmitting of dual-function radar-communication signal, and receiving beam-forming nulls in radar target direction and the communication direction to obtain communication signals and radar echo, since it can decrease mutual interference between the signals. Numerical simulations show that the proposed method of dual-function radar-communication sharing signal transmit-receive can improve the communication performance of the integrated system, and obtain more accurate radar target parameters.