The　experiments　of　three　full-scale　specimens　of　autoclaved　aerated　concrete　(AAC)　block　bearing　walls　with　core　columns,　subjected　to　laterally　low-cyclic　reversed　loading,　were　carried　out　to　investigate　their　seismic　performance,　including　their　failure　mode,　hysteretic　behavior,　seismic　load-carrying　capacity,　deformation,　stiffness　degradation　and　energy-dissipation　ability,　etc.　The　effect　of　the　wall＇s　opening　on　its　seismic　behavior　was　also　studied.　It　is　shown　that,　with　the　confinement　of　reinforced　concrete　core　columns,　AAC　block　composite　bearing　walls　have　a　good　ultimate　deformation　capacity　to　prevent　collapse　after　cracking.　So,　it　is　an　effective　measure　of　AAC　block　bearing　walls　for　the　purpose　of　seismic　resistance.　The　test　results　also　show　that　the　improvement　of　the　AAC　block　composite　bearing　walls　with　core　columns　mainly　depends　on　the　way　in　which　core　columns　are　used,　and　its　seismic　load-carrying　capacity　is　related　to　the　openings　of　the　wall,　decreasing　with　the　increase　of　the　size　of　openings.　The　study　provides　useful　references　for　application　of　the　structural　system　with　autoclaved　aerated　concrete　block　bearing　walls.