Abstract:In the paper,NS2 network simulation software is used to build wireless Local Area Networks simulation model in order to simulate the performance of DCF Agreement especially the throughput performance.Two mechanisms,both BAS mechanism and RTS/CTS mechanism,are under studied about the relationship between the throughput and the portfolio,the number of users and the length of frame.Through analysis and testing,and comparison of theoretical analysis, we at last draw the conclusion of the study and give out the method to improve it.