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UWB wireless communication systems have attracted attention as a new system that enables low power consumption, high speed communications, low costs and accurate locations capability. Since the UWB band overlaps the spectrum of existing narrowband and wide band systems, its worldwide acceptance is mainly conditioned by coexistence issues. In this paper, we propose a new route selection algorithm for UWB ad-hoc networks using geolocation capability of UWB systems and considering reduction of interference. We showed that the proposed algorithm can spatially avoid interference to other coexisting networks by Multi-hop using geolocation of coexisting nodes and confirm that the interference from a UWB network to other coexisting networks can be suppressed by shortening the hop interval. The route constructed with the proposal algorithm can improve the rate of time to give serious interference compared with the route constructed with the shortest hop. Additionally, average value of interference and the worst value of interference can be suppressed. But, the number of hops increasing by sending and receiving at each routing leads to the increase of time UWB occupies the bandwidth. For this problem, we show that the route that suppresses interference can be constructed in the proposal algorithm, even if the limiting condition is added.