In recent years, China's social economy is in a period of rapid development which has also made great progress in the construction of roads and bridges. Roads and bridges as basic building facilities provides strong support for local transportation and socio-economic development in China. At this stage, roads and bridges are the basic guarantee for the development of the national economy, so great attention must be paid to the quality of their construction and engineering design. At present, the main factor affecting the quality of road bridges in China is the problem of bridge cracks. There are various reasons causes for cracks they must be controlled by effective measures to better improve the quality of road bridges. This article will discuss crack control in road bridge design and construction.