According to the case that mass concrete of the main pier pile caps of Jiashao bridge is easy to crack in construction, because of the enormous section size, slow heat dissipation, easily inducing high inner-outer temperature difference, strong constraint of bottom concrete and piles, and it is difficult to repair the cracks on the pile are, because that the pile caps are all underwater, we design the standard of temperature controlling on the basis of simulated result of temperature and thermal stresses distribution of mass concrete. By taking some temperature control measures, such as controlling pouring temperature of concrete, applying recycling cool water, insulated and humidity curing, and controlling the quality of concrete, harmful cracks don’t appear in the main pier pile caps of Jiashao bridge and anticipated controlling effect is achieved.