To　easily　determine　the　load-displacement　curve　of　reinforced　concrete　two-way　slabs,　the　modified　segment　equilibrium　method　was　established　based　on　the　yield-line　theory,　and　the　three-stage　mode　was　proposed,　in　which　the　tensile　membrane　effect　was　taken　into　account　in　this　method.　Additionally,　the　nonlinear　procedure　for　modeling　the　behavior　of　reinforced　concrete　two-way　slab　was　developed　according　to　the　object-oriented　method　and　the　theory　of　shell　finite　element.　The　two　methods　were　used　to　predict　the　load-displacement　curves　and　ultimate　loads　of　reinforced　concrete　two-way　slabs.　The　nonlinear　program　was　also　used　to　verify　the　rationality　of　modified　segment　equilibrium　method.　The　result　shows　that　compared　with　the　finite　element　model,　the　modified　segment　equilibrium　method　is　simple　and　easy　to　calculate,　and　it　is　capable　of　predicting　the　load-displacement　curves　and　ultimate　loads　of　reinforced　concrete　two-way　slabs　with　reasonable　accuracy.