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Efficient resource management has been a very appealing issue in the operation of wireless communication system. With the goal of minimizing the total transmit power, we mainly discussed the constant-bit-rate (CBR) case for multiuser MIMO-OFDM system, and developed a novel dynamic subcarrier allocation criteria based on Alamouti scheme with a tradeoff between the complexity of implementation and BER performance against eigen beamforming. The proposed scheme, including antenna selection, dynamic subcarrier assignment among users and adaptive bit loading, can acquire transmitting/receiving diversity and multiuser diversity simultaneously. Simulations showed that the given scheme can optimize the system BER performance.