Abstract: The resource scheduling in the system of OFDMA is an effective method which can solve the resource-sharing problem in multi-service competition and improve the capacity of the system.Based on the down-link of the OFDMA system,this paper makes a comparative study on three classical packet scheduling algorithms which support Non-Real-Time(NRT) services and simulates the total throughput of the system and the fairness of the algorithms.The result shows that,compared with RR scheduling and Max C/I scheduling,the PF scheduling algorithm gets an excellent compromise between throughput and fairness,so it has obvious advantages.Finally,this paper points out the direction of improving resource scheduling algorithms.