Based　on　RSM　(Response　Surface　Methodology),　the　objective　function　and　constraint　conditions　are　approximately　explicit　to　overcome　the　difficulty　of　sensitivity　analysis　in　two-dimensional　continuum　structures,　sequential　quadratic　programming　model　is　used.　Combined　with　experiment　design　method,　very　few　design　points　were　used　to　obtain　constraint　conditions.　In　order　to　ensure　the　reliability　of　the　optimization　model,　a　second-order　approximation　function　to　each　constraint　function　is　researched　and　formed　to　compute　move-limits　for　the　current　design　point　and　adaptive　move-limits　evaluation　is　proposed.　An　example　is　given　to　show　the　efficiency　and　stability　of　this　optimization　strategy.