In this paper, we describe a novel self-localizationalgorithm. Self-Localizationmethods are required for to lowercomputational costand handling vague sensordata. Thus, we propose to use only uniformdistributionto represent probability distributions in Monte Carlo Localization (MCL),and name this method UniformMonte Carlo Localization(UniformMCL). Wemanifestthe low computational cost and robustness of UniformMCL in the environment of RoboCup Sony Legged Robot League. Keywords - Localization,Mote Carlo Method, Mobile robots, RoboCup.