Experiment　was　earned　out　to　simulate　different　loading　level　elements　under　coupling　of　stray　current　and　5%　chlorine　salt　solution　When　calculating　corrosion　of　reinforcement.　the　influence　of　loading　should　be　considered　based　on　the　first　law　of　Faraday　electrolysis　The　current　density　of　the　corrosion　was　measured　by　the　linear　polarization　resistance　method　The　function　of　corrosion　current　density　was　obtained　by　nonlinear　fitting　method.　and　the　influence　coefficient　of　loading　level　to　electrochemical　equivalent　was　obtained　base　on　the　function　of　corrosion　current　density　The　experimental　results　show　that　the　corrosion　current　density　increases　with　stress　ratio　of　concrete　structures　The　reinforcement　corrosion　weight　can　be　calculated　through　the　influence　coefficients　of　electrochemical　equivalent　and　the　result　is　in　line　with　the　actual　situation