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This computational study focuses on the dilution process and cyclic flow variation of a rotary engine system. In light load regions, rotary engines tend to become less stable than reciprocating engines. As visualization experiments have shown[ 1], the flow fields inside rotary engines themselves vary from cycle to cycle. Under certain conditions, even the dominant vortices during intake-compression process entirely change their directions very often. Fuel distribution inside rotary engines and the combustion may hence not be the same, even if operating conditions are kept constant. Furthermore, dilution gas, which thins fresh air-fuel mixture, makes engines’ stability worse by slowing combustion process, thereby leading to higher fuel consumption and other performances[ 2]. The two factors therefore hold the key to improve the performance.