Through analyzing generated mechanism of crack of concrete box-beam in high temperature season, it introduces prevention methods from primary materials control 、 regulation of concrete proportion 、 grouting of concrete and maintenance to control crack of box-beam according to construction experiences. 通过对高温季节混凝土箱梁裂缝产生机理的分析,根据施工经验,介绍了从原材料控制、混凝土配合比调整、混凝土的浇筑、养生等环节入手,控制箱梁裂缝产生的防治方法。