The forms and characteristics of the corroded beams are analyzed through flexural capacity test for corroded beams.According to test results and corrosion rate calculation method obtainded by the authors,calculation method of flexural capacity for corroded beams,as well as dangerous section prediction method is established.Campared to existing research results,adequate accuracy and practicability of this method can provide reference for residual flexural capacity and dangerous section prediction of corroded beams.