The biodiversity of zooplankton and analysis of water in 34 locations of the two river systems in Haihe River basin were investigated in 2009.Results obtained in this study showed that:in the Yongding River system and Luanhe River system,the protozoa were the most abundant zooplankton,accounting for 36.84% and 45.07%,respectively; the second richest category was rotifer,accounting for 31.58% and 39.44%,respectively; the third richest ones were cladocera,accounting for 21.05% and 8.45%,respectively,and the least were copepods,accounting for 10.53% and 7.04%,respectively.Analysis results of Shannon-Weaver diverstiy and Simpson index demonstrated that:the middle and lower reaches of the Yongding River and the Yongding New River were moderately polluted while Sanggan River,Yang River and upstream of Yongding River were heavily polluted; downstream of Luanhe River and the Qinglong River were moderately polluted while the upper and middle reaches of the Luanhe River and the Wulie River were heavily polluted.The quantity and biomass of the four categories of zooplankton in 34 locations of the two river systems were analyzed by hierarchical cluster analysis using SAS software.The results revealed that:in Yongding River system,sample locations of the middle and lower reaches of Yongding River and the Yongding New River were moderately polluted while sample locations of the Sanggan River,Yang River and upstream of Yongding River were heavily plluted; in Luanhe River system,sample locations of the downstream of Luanhe River and the Qinglong River were moderately polluted while sample locations of the upper and middle reaches of the Luanhe River and the Wulie River were heavily polluted.The principal component analysis with SPSS was used to analyze the quantity and biomass of four categories of zooplankton of 34 locations in the two river systems.Two main factors were used for producing interactive graph.The results obtained from the principal component analysis were coincident with those of the hierarchical cluster analysis.