To　obtain　the　optimal　design　of　membrane　structures　satisfying　the　stress　constraints,　according　to　the　full　stress　criterion　and　the　assumption　of　statically　determined　system,　the　thickness　of　membrane　structures　with　stress　constraints　is　optimized.　With　the　ratios　of　design　thickness　to　initial　thickness　of　membrane　elements　as　design　variables,　design　variables　linking　is　implemented　by　dimensionless　design　variables.　By　secondly　developing　the　MSC.　Nastran　and　Patran　software　with　MSC.　PCL　(Patran　command　language),　the　sectional　optimization　program　of　membrane　structures　is　implemented.　The　results　of　examples　show　the　reliability　and　efficiency　of　the　program　and　algorithm.