Stress-dependent　strains　monitoring　of　early-age　concrete　structures　by　embedded　vibrating　wire　sensors　is　investigated.　A　methodology　to　calculate　stress-dependent　strains　form　the　very　beginning　of　concrete　placing　is　developed,　which　can　be　done　directly　by　vibrating　wire　strain　readings　without　the　efforts　to　identify　time　dependent　parameters　such　as　expansion　coefficients　of　early　age　concrete.　Then　a　concrete　V　shaped　strut　of　a　long　span　bridge　is　instrumented　and　monitored　continually　for　a　period　of　14　days　by　vibrating　strain　and　temperature　sensors.　With　the　measured　strain　readings　and　temperature　data,　the　process　of　stress-dependent　strain　calculation　is　validated　and　the　strain　evolution　with　concrete　hardening　is　analyzed.　The　results　show　that　the　methodology　is　practicable　in　early　age　concrete　structures　and　make　stresses　calculation　more　convenient　and　accurate.　It　can　be　used　to　indicate　the　strain　developing　mechanism　and　to　identify　the　complicated　relationships　between　hydration,　deformation,　and　restraint　of　early　age　concrete.