在自然界中,大气降水是随机的,目前用概率论来描述,在水利工程规划阶段依据重现期来确定设计标准的高低,而且重现期大小只考虑工程规模(库容大小)。在一般情况下,工程规模较大,出事以后的损失就越大,所以设计的标准应该高一些。文章建议根据实际需要和最佳经济效果这两方面的考虑来选择适合的各种设计标准。 In nature, precipitation is random, and is currently described in terms of probability theory. The level of design standards is determined by the recurrence period in the stage of water conservancy project planning. Only the size of the project (storage capacity) is taken into account in the size of the recurrence period. Under normal circumstances, the larger the project, the greater the damage after the accident so the design standard should be higher. The article suggests that according to actual needs and the best economic effects of these two considerations to choose a variety of suitable design standards.