To　reasonably　evaluate　the　loading　carrying　capacity　of　the　concrete　cable-stayed　bridges,　according　to　traffic　survey,　a　method　of　traffic　load　calibration　is　proposed.　The　traffic　weight　is　modeled　as　normal　distribution　with　multi　peak　values,　the　traffic　load　response　is　modeled　by　the　Poisson　stochastic　process,　and　the　influences　of　average　daily　traffic,　velocity,　and　the　vehicles　composition　are　discussed.　There　are　large　differences　in　the　design　traffic　load　responses　with　the　real　response　under　different　traffic　conditions.　The　calibration　factor　of　95%　ascertains　is　obtained.　Finally,　the　method　is　demonstrated　by　taking　a　certain　bridge　as　an　example.