地下水水质是与水量同等重要评价地下水资源的因素,水质的好或坏是直接影响水资源是否被利用的一个主要方面,成都市位于成都平原东南隅。地下水类型属雨水补给潜水型,具有地下水水位埋藏浅,水量丰,增补快的特点。解放以来成都市人口在成倍地增加,建筑城区面积在扩大,由消费城市变为具有一定规模以电子、机械为中心的工业城市。文中论述了环境地质背景对水质变异之关系。同时指出了在五十年代起或近年来可比点之水质变异规 Groundwater quality is an important factor in evaluating groundwater resources as much as water quality. A good or bad water quality is a major aspect that directly affects the utilization of water resources. Chengdu is located in the southeast corner of Chengdu Plain. Groundwater type is a rainwater supply submersible type, with a shallow buried groundwater level, abundant water, add fast features. Since liberation, the population of Chengdu has increased exponentially. The area of ​​urban areas for construction has been expanding. From the consuming cities, it has become an industrial city with a certain scale of electronics and machinery. The paper discusses the relationship between environmental and geological background and water quality variation. At the same time pointed out that in the fifties or in recent years comparable water quality variation rules