A　cellular　automaton　(CA)　model　with　a　finer　discretization　of　space　is　proposed　to　simulate　a　non-emergency　evacuation　process　in　a　room　with　an　obstacle.　During　the　evacuation　process,　a　triangle　＂evading　region＂　phenomenon　has　been　observed　through　simulation　and　experiment　on　the　upstream　side　of　the　spatial　obstacle.　In　this　paper,　we　use　a　simple　method　to　generate　an　obstacle　floor　field　corresponding　to　the　triangle.　We　investigate　the　relationship　between　the　pedestrian　trajectories　and　the　obstacle＇s　position.　We　also　study　the　effect　of　the　obstacle　on　evacuation　time　and　average　evacuation　speed.　Our　study　provides　insights　into　the　simulation　of　obstacle　avoidance　behavior　of　pedestrians　in　simple　scenarios.