Hydrogen　leakage　in　hydrogen　fuel　cell　buses　can　cause　danger　to　the　public.　Cuboid　space　finite　element　models　are　established　to　study　the　effect　of　obstacle　positions　on　the　hydrogen　dispersion　behaviour　under　no　venti-lation,　natural　ventilation　and　mechanical　ventilation　by　monitoring　the　hydrogen　concentration　along　the　line　and　on　the　iso-surface.　The　effect　of　the　obstacle　on　the　hydrogen　dispersion　behaviour　is　enhanced　with　the　reduction　of　the　distance　from　the　obstacle　to　the　leakage　location.　In　the　space　with　no　ventilation,　the　effect　of　the　obstacle　on　hydrogen　dispersion　varies　with　the　dispersion　phase.　In　the　naturally　ventilated　space,　the　concentration　of　hydrogen　on　the　side　with　an　obstacle　is　higher　than　that　on　the　side　without　any　obstacles;　thus,　the　presence　of　the　obstacle　is　not　conducive　to　hydrogen　exiting　the　compartment.　In　the　mechanically　ventilated　space,　the　effect　of　the　obstacle　on　hydrogen　dispersion　is　more　pronounced.　Specifically,　the　hydrogen　concentration　on　the　side　with　no　obstacles　is　2-3　times　that　on　the　side　with　an　obstacle,　so　the　obstacle　is　conducive　to　hydrogen　exiting.　The　obstacle　is　recommended　to　be　in　the　focus　of　the　related　hydrogen　leakage　behaviour　study.