In　order　to　reduce　process　complexity　and　manufacturing　difficulty,　we　proposed　to　use　a　single　air　distribution　plate　to　guide　the　flow　and　achieve　uniform　air　distribution.　We　established　a　three-dimensional　model　with　a　size　ratio　of　1:1　to　simulation　flow　pattern.　The　optimization　results　revealed　that　it　is　feasible　to　implement　our　assumption.　After　the　asterisk　plate＇s　optimization,　the　area　uniformity　index　in　the　catalytic　section　was　maintained　above　0.92　with　a　maximum　value　of　0.95,　the　relative　standard　deviation　was　lower　than　0.2,　and　the　minimum　value　was　0.123;　and　the　pressure　drop　was　less　than　3.00　Pa,　which　is　in　line　with　the　actual　use　requirements.　Among　them,　Asterisk　I　with　a　30　mm　thickness　and　15　mm　right　shift　has　the　best　optimization　effect.　(c)　2021　American　Society　of　Civil　Engineers.