The　building　sector　accounts　for　more　than　40%　of　the　global　energy　consumption.　This　consumption　may　be　lowered　by　reducing　building　energy　requirements　and　using　renewable　energy　in　building　energy　supply　systems.　Solar　air-conditioning　systems　(SACS)　are　a　promising　solution　for　the　reduction　of　conventional　energy　in　buildings.　The　storage,　especially　the　cold　storage,　plays　an　important　role　in　SACS　for　unstable　solar　irradiation.　In　this　paper,　we　took　the　absorption　refrigerating　unit　as　an　example,　and　the　solar　air-conditioning　system　of　an　office　building　in　Beijing　was　simulated.　The　accuracy　of　this　model　was　verified　by　comparing　with　the　SACS　operation　data.　Moreover,　based　on　the　simulation　data,　the　cold　storage　capacity　of　the　solar　air-conditioning　system　in　different　climatic　regions　was　studied.　The　cold　storage　capacities　of　SACS　in　20　cities　distributed　in　different　climate　regions　were　studied　systematically.　The　results　simulated　by　our　proposed　model　will　be　beneficial　to　the　SACS　design,　and　will　enlarge　the　application　of　SACS.