Abstract: ThispaperprovidesanoptimalentrytrajectoryofthewingedMarsprobe,rightafteritchangedtheorbitintotheMartianatmospherebrakedbyreversethrustengine.ThispaperestablishesMartianatmospheremodelandgravitationalfieldmodelcorrespondingonthedensityoftheMartianatmosphereandgravitationalfieldparameters,anddeterminedthedynamicequationsoftheMarsprobe.Withinalltheconstraintconditionsintheenteringprocess,thispaperdesignsanoptimalentrytrajectorybasedonthegeneticalgorithm.Inaddition,thispaperprovidesdifferentthrustengineschemethroughcomparingthem.Theresultsshowthatthesecondschemecanachievetheoptimalperformanceindexandthelandingspeedis136m/s,ultimatelyrealizingtheminimumconsumptionofenergyandaerodynamicheatemissionstructurequalityintheprocessofenteringandsoftlanding.

Key words: Trajectoryoptimization, Atmosphericmodel, Gravitationalfieldmodel, Geneticalgorithm, Marsprobe