在当今水环境劣化趋势日益严峻，水资源日益短缺的势态下，在污水深度处理、超深度处理和回收利用已经实用化了的今日，排水系统不应仅仅是排除雨水、污水及保护城市环境和公共水域水质的基础设施，更应升华为维系城市健康水循环和良好水环境，实现水资源可持续利用的人类社会的生命线工程。城市污水作为可贵的淡水资源已为世人所瞩目。文章阐述了在排水系统功能、规划和设计方面的新构想和新观念。

At present, under the condition that the water resource is deficient day by day and the worsen trend of water environment is becoming severe increasingly, as well as the advanced and super advanced treatment and the reuse of waste water have been practicable, drainage system should not only be the basic facilities for draining rain and sewage and protecting city environment and water quality of pubic water basin, but also be sublimated to the lifeline project of human society that maintains healthy water cycling and good water environment and realizes sustainable utilzation of water resource. As a valuable drinking water resource, sewage has attracted more and more attention. The article elaborates on the author´s new ideas and concepts about the function, programming and design of drainage system.