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It is difficult to provide QoS guarantees for streams in wireless network based on IEEE802.11 DCF because of limited bandwidth. Taking CBR traffic as example, we studied the traffic performance with different parameters in this paper. The results show that for an overloaded network, the traffic with longer packet size has greater throughput. Since the MAC layer performs the same competitive algorithm, the node in the same competitive environment has almost the same capacity to occupy the channel. Then, the traffic with longer packet size can send more data in the occupied channel. The greater throughput is gained. Based on this conclusion, we can differentiate traffics by setting different parameters to improve QoS of traffic in an overloaded network.