Here,　the　optimal　design　method　for　integrated　sensor　systems　including　both　strain　and　displacement　measurement　sensors　with　the　objective　of　possible　best　reconstruction　of　structural　responses　using　Kalman　filtering　algorithm　was　proposed.　The　locations　were　deleted　from　the　candidates　under　the　condition　that　the　deletion　caused　the　minimum　reconstruction　error　until　either　the　normalized　maximum　reconstruction　error　variance　or　the　average　theoretical　one　reached　the　predefined　threshold.　Then,　the　numbers　and　locations　of　the　two　types　of　sensors　were　determined.　A　two-dimensional　truss　structure　was　presented　as　a　numerical　example　to　investigate　the　effectiveness　and　accuracy　of　the　proposed　approach.　The　results　indicated　that　the　reconstructed　responses　are　in　good　agreement　with　the　real　ones　and　the　integrated　sensor　system　provides　a　better　reconstruction　of　structural　response　than　the　single-type　sensor　system　does.