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The growth of the wireless and mo-bile communication data traffic has brought severe challenges to the present telecommu-nication systems. To meet the ever-increasing mobile traffic demand in the next 5th genera-tion (5G) communication systems, deploying 5G in the unlicensed spectrum (5G-U), has been regarded as a promising technology. The Third Generation Partnership Project (3GPP) has specified the standardization of the Li-censed Assisted Access (LAA) and its exten-sion enhanced LAA (eLAA), to opportunisti-cally transmit in the unlicensed spectrum. The LAA/eLAA systems share unlicensed spec-trum resource with other networks, e.g., the Wi-Fi systems. In this article, we analyze the coexistence between the eLAA and the Wi-Fi systems in the unlicensed spectrum. We firstly establish the system model where the eLAA coexists with the Wi-Fi systems. Then, we the-oretically derive and figure out the unfaess in the multi-channel occupancy rate between the eLAA and the Wi-Fi systems. After that, we propose a weight based channel selection method to improve the faess of the coexis-tence. The numerical results demonstrate that by avoiding contentions and declining colli-sions, our method not only enhances the fair-ness, but also improves the overall unlicensed spectrum usage rate.