In order to study the water environment quality and risk of the main inflow rivers of Nansi Lake, water was sampled in fourteen inflow rivers in 2013. Three routine（COD, NH₃-N and TP）indexes and the concentrations of 4 heavy metals（Cr, As, Cd and Pb）were analyzed. Water quality, spatial distribution characteristics and risk of heavy metals were assessed using a combination method of comprehensive pollution index, analytic hierarchy and risk quotient. The results are shown as follows: The most polluted rivers are Xuechengxiaosha river, Xuechengdasha river, Chengguo river and Laoyun river, whose values of comprehensive pollution index are 1.943, 1.744, 1.302 and 1.713, respectively; and attention should be paid to the pollution of TP. The result of analytic hierarchy agrees with the result of comprehensive pollution index. The result of risk quotient for heavy metals shows that the risks of Cr⁶⁺, Pb and As are lower but Cd has a certain risk. The overall water quality of inflow rivers of Nansi Lake is good.

water environment  /  heavy metal  /  pollution assessment  /  spatial distribution  /  inflow rivers of Nansi Lake