Cable-truss　structure　is　a　typical　form　of　cable-strut　tensile　structures,　which　consists　of　upper　cable　system,　lower　cable　system　and　several　vertical　struts.　As　with　the　general　cable-strut　tensile　structure,　only　when　the　reasonable　geometric　shape　matches　the　feasible　prestress　distribution　can　the　cable-truss　structure　obtain　structural　stiffness　and　bear　the　external　load.　Once　the　geometric　shape　is　unreasonable,　the　cable-truss　structure　is　just　a　mechanism　without　bearing　capacity　and　cannot　be　stiffened　by　introducing　prestress.　Consequently,　a　reasonable　geometry　is　the　premise　for　cable-truss　structure　to　become　an　effective　load　bearing　system.　In　this　paper,　an　equivalent　equilibrium　force　model,　called　EEFM,　is　proposed　according　to　the　geometric-mechanical　characteristics　of　cable-truss　structures.　A　cable-truss　structure　in　this　model　is　split　into　upper　and　lower　cable　systems　with　equivalent　nodal　forces.　The　geometric　rationality　can　be　easily　evaluated　from　the　equivalent　nodal　force　relationship.　According　to　the　geometric　topology　and　equilibrium　equation　of　two　cable　systems,　the　self-stress　mode　of　the　structure　with　reasonable　geometry　can　be　directly　obtained.　For　structures　with　unreasonable　geometry,　the　node　coordinates　of　one　cable　system　are　corrected　based　on　the　other　cable　system.　Several　cases　are　presented　to　verify　the　accuracy　and　validity　of　the　proposed　method.　This　method　can　be　used　for　shape　design,　geometric　correction　and　force　finding,　and　has　greater　advantages　for　cable-truss　structures　with　asymmetric　or　complex　space　configuration.