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In this paper, we propose a novel cross layer packet scheduling algorithm for real time (RT) traffics in multiuser downlink MIMO-OFDMA wireless systems. The algorithm dynamically allocates the resources in space, time and frequency domain based on the channel state information (CSI), users' quality of service (QoS) requirements and queue state information (QSI). To provide high data rate and high spectrum efficiency, adaptive modulation and coding (AMC) is employed on every eigenmode subchannel. The proposed algorithm can improve the cell throughput, increase the number of users that can be supported and guarantee users' QoS requirements and the fairness among all users. Simulation results indicate that the proposed algorithm is able to get superior performances.