Experiment　is　carried　out　to　simulate　different　loading　level　element　under　coupling　of　stray　current　and　5%(by　mass)　chloride　solution.　When　calculating　corrosion　of　reinforcement,　the　influence　of　loading　should　be　considered　based　on　Faraday＇s　first　law　of　electrolysis.　The　corrosion　current　density　was　measured　by　the　linear　polarization　resistance　method.　The　function　of　corrosion　current　density　was　obtained　by　nonlinear　fitting　method.　Based　on　the　function　of　corrosion　current　density,　the　influence　coefficient　of　loading　level　to　electrochemical　equivalent　was　obtained.　The　results　show　that　the　corrosion　current　density　increases　with　the　increase　of　stress　ratio　of　concrete　structures　and　through　the　influence　coefficients　of　electrochemical　equivalent　the　reinforcement　corrosion　weight　can　be　calculated　and　the　result　is　in　agreement　with　the　actual　situation.