目前我国在建混凝土坝的高度、数量、规模均居世界第一位，文章就混凝土坝技术的几个重要问题进行讨论：（1）结束“无坝不裂”历史的关键技术；（2）应用氧化镁混凝土筑坝的两种指导思想和两种实践结果；（3）混凝土强度等级应用于混凝土坝欠妥，坝工混凝土仍以采用混凝土标号为宜；（4）我国特高拱坝的抗压安全系数偏低，应适当提高。（5）拱坝有限元等效应力问题。

The number, the height and the size of concrete dams under construction in China are the biggest ones in the world. Some important problems about concrete dams are discussed in this paper: (1) The key technique for terminating the history of “no dam without crack”.(2) Two kinds of guiding thoughts and two results of practical engineering for application of MgO concrete to dam. (3) Concrete mark based on 90 d or 180 d age is more appropriate for concrete dams than concrete class based on 28 d age . (4) The safety factor for compressive stress for the specially heigh concrete arch dam (higher than 200 m) is some what low in China (5) The equivalent stress in arch dams analysed by the finite element method.