Abstract: After the operation of the Northern Bridge in Dongguan, such troubles as seepage and openings were found at the deck slabs wet-jointed between T-beams. For such troubles, the additional RC paving reinforcement with both steel fibres and bars is regarded as highly applicable to the bridge. Investigates the parameters and construction process relevant to the method of reinforcement. The numerical software MIDAS-Civil was thus used to model the mechanical behavior of the bridge. The interconnection between the new and existing concrete bridge structures was simulated taking account of the overload and shrinkage creep of concrete. The spacing between anchoring bars and optimal thickness of concrete bridge deck were then given. Assuming that the microcracks are continuous and hinged joints, a conclusion is drawn that getting rid of the existing deck slab cast in site, which was the source of the troubles as above, the bridge will be improved greatly. The construction process as a way to reinforce the bridge has been accepted successfully to use.