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FuTURE B3G TDD is designed to provide 100 Mbps peak data rate in both uplink and downlink. In this paper, the MIMO channel measurement campaign carried out in BUPT campus is briefly introduced. Based on the results from the field channel measurement, the radio transmission parameters of physical layer is optimized, and the downlink performance of FuTURE B3G TDD is evaluated in system level with soft frequency reuse and spatial-temporal-frequency scheduling for multiuser zero forcing beamforming, which is designed to explore the multiuser diversity gain at both spatial and frequency domain. As the channel reciprocity can be obtained in TDD system, the Channel State Information (CSI) can be exploited at the transmitter to obtain the spatial-frequency multiuser diversity by joint spatial-frequency subcarrier and antenna assignment of MIMO OFDMA for the independent fading of different user in spatial and frequency domain. With the optimised radio transmission parameters, the peak data rate and system throughput can be improved 12.7%. The downlink system throughput in multi-cell scenario can achieve about 30 Mbps with 4times2 MIMO in 10 MHz bandwidth.