Abstract: Previousstudiesonspacesolarpowerstation（SSPS）havesimpleassumedgeostationaryorbit,whileitisnotthebestorbitforSSPS.Aneworbit,knownasthegeosynchronousLaplaceplanewasputforward,whichwassuperiortogeostationaryorbit.
Firstly,theorbitaldynamicsandtheperturbationswhichaffecttheorbitalmotionweremodeled,includingEarth′snonsphericalperturbation,LuniSolargravitationalperturbation,solarradiationpressureperturbationandmicrowavebeamingforceperturbation.Secondly,threeevaluationindexes,includingreceivedpower,orbitapplicabilityandspacesecurity,werepresentedtodiscusstheadvantagesoftheproposedLaplaceorbitratherthanthegeostationaryorbit.Finally，thelongtermnumericalsimulationwasprovided.AndtheresultshowsthattheSSPSworkinginthegeosynchronousLaplaceorbitcansave364534kilogramsoffuelwhichisusedfororbitmaintaincomparingtotheSSPSworkinginthegeostationaryorbitwiththesamereceivedpowerandmeetingthedemandofpowersupply.

Key words: spacesolarpowerstation(SSPS), orbitdynamics, Laplaceorbit, geosynchronousorbit(GEO), microwavebeamingforce, receivedpower