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Numerous researches have shown that the original DCF access mode of IEEE 802.11 has low performance in case of heavy traffic and multi-hop environment [Yong Peng, et al., IEEE GLOBECOM 2002] [Shugong Xu, et al., IEEE GLOBECOM, 2001]. Based on the analysis of previous IEEE 802.11 DCF, [Yong Peng, et al., IEEE GLOBECOM 2002] have introduced a parameter that closely relative to the traffic load of the current wireless LAN and formed a new DCF-based protocol with the name NSAD, which is proved effective in the simple one-hop environment. In this paper, we proposed a new exchange protocol for fine tune NSAD. Our goal is to solve the problems that NSAD encountered in the error-prone multi-hop environment. We have done simulation in a more real environment than we do in NSAD [Yong Peng, et al., IEEE GLOBECOM 2002] and the results have shown that the proposed algorithm can achieve better performance when compared to the original NSAD algorithm (e.g. better property in goodput and fairness, window tuning accuracy).