According to cracks of mass concrete in this paper the causing reasons are analyzed and from selection of proper mix proportion, concrete pouring and other aspects corresponding prevention and control measures are proposed, which has a certain instruction value for mass concrete construction. 对大体积混凝土裂缝的产生原因作了分析,并从合理选择配合比、混凝土的浇筑等方面提出了防止裂缝产生的主要措施,对提高混凝土施工质量具有指导作用。