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The adaptive antenna-array based OFDM system always uses beamforming to choose the channel with largest Eigenvalue to transmit the OFDM block symbol. Such selection diversity is a simple way. However, it does not make full use of the capacity antenna-array promise. With the goal of maximizing the system throughput with a limited power for the target BER, a novel dynamic subcarrier and power allocation scheme based on SVD decomposition is proposed in this paper. We investigate the algorithm in three backgrounds: the impact of SNR, antenna number and user number. Numerical simulation results show that the proposed subcarrier and power assigning algorithm yields a much larger multiplexing gain than the largest Eigen model.