English：

Due to the disadvantages of traditional bridge reinforcement methods, such as great damage tooriginal girder and long construction period, a method is explored for improving the bearing capacity ofbridge based on load redistribution without damage to original girder,which is applied successfully in thestrengthening of Shichuan River Bridge. In the paper, there are expounded such as the basic principle ofthe combination of the new steel plate girder and the original girder, the pre-camber of the steel plategirder, the way to realize the dead load distribution by the steel plate girder lifting, and the self-adaptiveadjustment of the transverse and longitudinal slopes of the new steel plate girder and the original girder,the construction process and key points are introduced in detail about the bridge bearing capacityenhancement based on load redistribution.