In　order　to　study　the　performance　of　base　force　element　method　(BFEM),　a　new　2-node　degenerated　plane　element　model　based　on　the　BFEM　of　complementary　energy　principle　is　presented　for　linear　elasticity　problem　and　geometrically　nonlinear　problem　respectively　in　this　paper.　The　plane　truss　element　model　can　easily　be　obtained　by　degenerating　from　a　four-mid-node　plane　element　of　the　BFEM　based　on　complementary　energy　principle　for　linear　elasticity　problem　or　geometrically　nonlinear　problem.　The　compliance　matrix　of　the　rod　element　model　is　same　as　the　compliance　matrix　of　the　four-mid-node　plane　element　of　the　BFEM.　According　to　the　characteristics　of　analysis　for　truss　structure,　the　nodal　equilibrium　conditions　and　the　displacement　coordination　conditions　of　each　rod　at　the　nodes　have　been　considered　when　the　compliance　matrix　of　structure　is　integrated.　In　order　to　verify　the　feasibility　of　the　degenerated　plane　element　model,　several　truss　problems　are　analyzed　and　their　solutions　are　compared　to　the　analytical　solutions　and　the　numerical　results　which　are　calculated　with　the　traditional　displacement　FEM.　It　is　found　that　the　model　has　shown　high　precision　and　good　performance.