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Fiber-Wireless (FiWi) access network has become one of the most attractive research fields due to the advantages of Passive Optical Network (PON) and Wireless Local Area Network (WLAN) which are two main part of a FiWi network [1]. Since PONs in FiWi networks contribute large bandwidth for the backhaul partition, the limitations in traffic throughput only come from WLANs comprising gateways (GWs), access points (APs) and users, as shown in Fig. 1. This figure shows the problem of connecting all APs to their closest GWs in WLANs, which causes the unfairness between GW1 and GW2 because GW1 has to service 10 users while GW2 only need to provide network connection to 4 users. This motivates us to propose a gateway selection method to resolve the unfair problem in FiWi networks.