Abstract: Thegoverningequationsofcomponentsforcabinatmosphericenvironmentalcontrolsysteminmannedspacecraftwerebuilt.ThegeneralmethodofestablishingmodellibraryusingmultidomainunifiedmodelingmethodbasedonModelicawaspresented.Apowerfullibrarywithhighreusability,extensibilityandfeasibilitywasbuiltfortheenvironmentalcontrolsystem.Akindofenvironmentalcontrolsystemincludinganatmospherecontrolandsupplysubsystem(ACSS),atmosphererevitalizationsubsystem(ARS)andatemperatureandhumiditycontrolsubsystem(THCS)wasmodeledtocarryouttheperformanceanalysisandthecontrolstrategystudy.Theinvestigationshowsthatthreesubsystemsarecoupleddeeplyandhaveinfluenceoneachother.TheactivetemperaturecontrolmethodisappropriateforTHCS.Andabettercontrolstrategyofactivetemperatureandhumiditycontrolwasputforwardtoachievemoreeffectivecontrolcapability.Thecrewactivitylevelshouldbeconsideredasavariation,whichhasheavyeffectsonothersubsystems.Theestablishedmodellibraryandanalysisresultsprovideanefficientwaytoimprovethedesignandrunningmanagementofthecabinenvironmentalcontrolsysteminthemannedspacecraft.

Key words: Atmosphericenvironmentalcontrol, Modelica;Objectorientedmodeling, Temperatureandhumiditycontrol, Mannedspacecraft