This　paper　aims　to　reveal　the　effect　of　intake　closing　timing,　and　engine　speed　on　the　flow　field,　flame　propa-gation,　combustion　characteristics,　and　emissions　formations　of　a　small-scaled　side　ported　hydrogen-fueled　Wankel　rotary　engine.　For　this　reason,　a　three-dimensional　dynamic　simulation　model　was　established　using　a　reasonable　turbulent　model　coupled　with　a　kinetic　reaction　mechanism　and　validated　by　the　experimental　data.　Simulation　results　show　that　an　earlier　intake　closing　timing　increases　the　volumetric　efficiency　and　increases　intake　loss.　The　increasing　speed　improves　the　volumetric　efficiency　while　causing　a　higher　intake　loss.　There　are　two　peaks　of　the　turbulence　kinetic　energy　during　the　intake　stroke.　The　first　one　is　caused　by　the　airflow　hitting　the　wall,　and　the　other　is　due　to　the　backflow.　During　the　flame　development　period,　due　to　the　strong　unidi-rectional　flow　in　the　combustion　chamber,　which　is　not　conducive　to　flame　propagation　backward.　This　phe-nomenon　is　more　pronounced　at　higher　engine　speeds,　resulting　in　a　merged　flame　front　not　exceeding　the　trailing　spark　plug.　The　lean　combustion　leads　to　a　lower　in-cylinder　combustion　temperature,　deteriorating　the　NOx　generation　environment.　This　paper　provides　a　feasible　method　for　matching　the　operating　conditions　and　intake　system.