The design of packet scheduling strategy and algorithm is one of the most important issues for the high-speed packet-switched networks. Because the packet scheduling strategy has multiple performance objects, how to reach multiple objects simultaneously is a difficult problem. Based on the proportional fairness principle, a proportional fairness scheduling (PFS) strategy in packet-switched networks is provided. The PFS integrates several objects, such as network performance, user抯 QoS requirement and system fairness.And the proposed strategy is analyzed and proved in detail.Moreover,the proportional fairness scheduling strategy can be applied to design and improve the packet scheduling strategy and algorithms in packet-swithched networks.