Corrosion pit is the main cause of mechanical performance degradation for the cable of cable-supported bridge.Considering corrosion pits andwith the safety factor of cable under load less than 2.5 as failure criterion， the method for assessing the safety capability for cable was established based on equivalent crack for corrosion pit and fracture mechanics. The Yuanzhou bridge wire corrosion rate data was taken to perform the parameter sensitivity analysis., The quantity of broken wires when cable failed and the time with safety coefficient less than 2.5 were studied. The results showed that this method could predict wire fracture number and the time with safety coefficient less than 2.5 and compared with uniform corrosion theory model, this mehtod provided theoretical reference for cable-supported bridge operation and maintenance.