Since the founding of China, China's bridge construction has been a rapid development, tens of thousands of bridges to make the moat into the road. However, in the many completed bridges, there are many bridges have insufficient bearing capacity phenomenon. This situation is caused by many reasons, such as: the old bridge original design standard is low, can not adapt to the current traffic flow and model changes; highway reconstruction bridge failed to synchronize the transformation, so that the "road new bridge old"; bridge materials, construction quality; lack of attention to the maintenance of bridges ...... and so on. But no matter what, these problems of the bridge if not timely maintenance, reinforcement, strengthening, will certainly affect the traffic conditions in China, resulting in traffic hazards, and even cause the loss of people's lives and property. OVM Newsletter" published in this issue of the Liuzhou City Construction Machinery General Factory in the old bridge reinforcement of two articles, in order to bring similar projects to provide some reference!