This　paper　applies　a　numerical　approach　to　improve　the　understanding　of　reaction　to　various　inflow　conditions　for　the　compressor　system　and　the　mechanism　of　stall　inception　under　rotating　inflow　distortions.　Full　annulus,　unsteady,　three-dimensional　computational　fluid　dynamics　has　been　used　to　simulate　an　axial　low-speed　compressor　operating　under　rotating　distorted　inflow　conditions.　The　development　of　the　flow　through　the　rotor　is　then　explained　in　terms　of　the　redistribution　of　the　flow　field　and　the　process　of　stall　inception.　The　results　suggest　that　the　increased　flow　incidence　close　to　the　tip　region　under　co-rotating　inflow　distortion　plays　an　important　role　on　the　stall　inception　process.　The　presence　of　a　strong　modal　wave　is　observed　under　co-rotating　inflow　distortions.　This　leads　to　a　significant　impact　on　the　loss　of　stall　margin,　as　compared　with　other　distorted　inflow　conditions.　There　is　a　significant　peak　in　the　flow　coefficient　at　stall　for　co-rotating　inlet　distortion.　It　can　be　interpreted　as　a　resonant　behavior　of　the　compressor　under　a　strong　interaction　between　the　flow　field　and　inlet　distortion.　It　indicates　that　the　stall　inception　is　triggered　by　the　perturbation　of　the　rotating　distorted　inflow　through　the　long　length　scale　disturbances.