Non-linear　analysis　of　autoclaved　aerated　concrete　(AAC)　block　masonry　composite　wall　with　reinforced　concrete　(RC)　core　columns　has　been　conducted　using　finite　element　software　ABAQUS.　First,　the　numerical　results　from　finite　element　analysis　were　verified　with　laboratory　results　of　full-scale　AAC　masonry　wall　specimens.　Effects　of　vertical　stress　on　seismic　performance　were　investigated.　The　analysis　indicates　that　lateral　load　capacity　of　the　wall　is　affected　by　the　openings　greatly　and　increased　with　the　increase　of　vertical　stress.　The　effect　of　vertical　stress　on　the　wall　without　openings　is　more　obvious　than　that　with　openings.