To　analyze　the　effects　of　hydrogen　charge　concentration　(HCC)　and　injection　angle　(IA)　on　the　lean　combustion　in　a　gasoline　Wankel　engine,　the　present　work　implemented　a　numerical　simulation　model　coupling　with　the　kinetic　mechanisms　and　validated　with　the　experimental　data.　Results　found　that　with　the　increase　in　HCC,　the　penetration　of　hydrogen　injection　is　enlarged　and　the　area　of　the　high-speed　jet　flow　is　expanded.　The　jet-flow　area　for　IAs　of　45　degrees　or　135　degrees　is　larger　than　that　of　90　degrees.　Changing　IA　could　obtain　the　hydrogen　distribution　at　different　regions　of　the　rotor　chamber　and　IA　of　90　degrees　acquires　the　smallest　hydrogen-rich　region.　Increasing　IA　brings　about　the　reduced　flame　speed　substantially;　the　flame　area　for　IAs　of　45　degrees　and　90　degrees　expands　with　the　increment　of　HCC　whereas　the　contrary　pattern　is　witnessed　at　the　IA　of　135　degrees.　Smaller　IA　leads　to　the　major　burning　occurring　untimely,　which　resulting　in　less　work　delivery　of　the　engine.　The　hydrogen　consumption　for　lAs　of　45　degrees　and　90　degrees　increases　as　HCC　is　ascendant　while　that　for　IA　of　135　degrees　is　just　the　reverse.　Variations　in　the　mixture　distribution　and　turbulence　are　the　intrinsic　mechanism　of　how　the　HCC　and　IA　reflects　the　combustion　progress.　As　hydrogen　is　injected　with　larger　HCC　and　smaller　IA,　a　relatively　richer　mixture　and　higher　turbulent　kinetic　energy　are　distributed　close　in　the　spark　ignition　region.　The　peak　combustion　pressure　reduces　and　its　corresponding　crank　position　delays　with　the　widened　IA　at　any　HCC.　Considering　the　fuel　combustion　and　nitric　oxide　formation,　as　hydrogen　volume　fraction　is　3%　and　IA　is　45　degrees,　the　engine　could　realize　the　optimized　performance　under　the　computational　condition.　An　efficient　combustion　performance　may　be　performed　in　engineering　application　if　the　hydrogen　IA　is　in　accordance　with　the　rotor　rotating　direction　at　lower　HCC.