In　this　paper,　finite　element　model　updating　procedure　using　multiobjective　optimization　technique　(MOP)　is　proposed.　The　weighting　factor　for　each　objective　function　is　not　necessary　in　this　method.　In　MOP,　the　notion　of　optimality　is　not　obvious　since　in　general,　a　solution　vector　that　minimizes　all　individual　objectives　simultaneously　does　not　exist.　Hence,　the　concept　of　Pareto　optimality　is　used　to　characterize　the　objectives.　The　multiobjective　optimization　method,　called　the　goal　attainment　method　is　used　to　solve　the　optimization　problem.　The　Sequential　Quadratic　Programming　(SQP)　algorithm　is　used　in　the　goal　attainment　method.　The　implementation　of　the　dynamically　measured　modal　strain　energy　identified　from　ambient　vibration　measurements　is　investigated　and　proposed　for　model　updating.　The　eigenfrequencies　and　modal　strain　energies　are　used　as　the　two　objective　functions　of　multi　objective　optimization　technique.　The　FE　model　updating　procedure　is　illustrated　with　the　examples　of　simulated　simply　supported　beam.