综合运用图解法、格鲁布斯检验法、夏皮洛-威尔克检验法等，对地下水化学特征及地下水环境背景值进行分析与计算。研究结果表明：伊犁河谷平原区地下水阳离子以Ca2+、Mg2+为主，阴离子以HCO3-为主，地下水主要水化学类型为HCO3-Ca、HCO3-Ca-Mg、HCO3-SO4-Ca-Mg；该区地下水化学成分的形成以溶滤作用、阳离子交替吸附作用为主，还与人类活动有关。地下水化学元素分布类型以对数正态分布为主，正态分布较少，无偏态分布类型。本项研究对该区地下水的环境影响分析和预测，判断环境污染程度及评定环境质量的优劣，合理开发利用地下水资源具有重要意义。

Using the Graphic method, Grubbs test, Shapiro-Wilk method etc, this paper analyzed the hydrochemical characteristics of groundwater and then calculated the environment background values. The results showed that the main cations of the plain area of Yili River were Ca2+ and Mg2+, and the main anion was HCO3-. HCO3-Ca, HCO3-Ca-Mg, and HCO3-SO4-Ca-Mg were the main hydrochemical types of groundwater. The chemical composition of the groundwater in this area was mainly related to leaching effect, cation exchange and adsorption, but also depended on human activities. The study is of great importance to the groundwater environmental impact analysis and prediction, judgment of environmental pollution and quality assessment, reasonable exploitation and utilization of groundwater resources.

中央高校基本科研业务费（ZY20160308，ZY20110103），中国地质调查局地质调查项目 (121201011000150021)