Structural　damages　are　identified　by　the　technique　of　structural　optimization.　In　the　damaged　region,　elemental　damage　indexes　are　selected　as　design　variables,　local　strain　mode　difference　between　undamaged　and　damaged　structure　is　minimized.　The　structural　identification　model　is　solved　by　the　series　linear　programming.　The　solution　is　the　distribution　of　elemental　damage　indexes　in　the　damaged　region.　Numerical　simulation　indicated　that　the　proposed　method　could　locate　damages　and　estimate　damage　degree　correctly.