Truss　elements　are　widely　used　to　model　compression　rods　of　prestressed　spatial　structures　with　commercial　FEA　softwares.　The　deficiency　of　the　modeling　method　was　that　the　rod　buckling　behaviour　can　not　be　considered.　To　overcome　it,　a　new　modeling　method　in　which　rods　were　modeled　with　several　beam　elements　considering　the　initial　equivalent　imperfections　was　presented.　The　buckling　analysis　of　a　BSS　shows　that　the　interaction　of　actual　buckling　behavior　of　compression　rods　with　that　of　the　structure　can　be　considered　by　the　new　method,　and　it　is　an　appropriate　and　valid　method　to　model　the　prestressed　spatial　structures　with　commercial　FEA　softwares.