The　major　purpose　of　the　present　study　is　the　theoretical　modeling,　numerical　simulation　and　optimal　analysis　of　a　space　solar　dynamic　power　system.　Using　the　method　of　system　analysis,　a　mathematical　and　physical　model　is　developed　to　describe　the　process　of　energy　transfer　and　conversion　in　a　space　solar　dynamic　power　system.　As　a　new　assessing　criterion　for　total　launch　mass,　it　is　proposed　to　combine　the　system　mass　and　aerodynamic　drag　area　into　a　unified　criterion.　The　effects　of　the　configurations　and　operating　parameters　on　the　system　performance　are　analyzed　and　the　optimal　scheme　of　a　space　solar　dynamic　power　system　is　obtained　by　numerical　simulation.　(C)　2003　Elsevier　Ltd.　All　rights　reserved.