Abstract: In order to investigate the influence of effluents from the sewage treatment plants to the receiving waters, XAD-8, anion-exchange and cation-exchange resins were used to separate and enrich the effluents from different sewage treatment plants and the samples from the upstream and downstream of the Zhu Zhuan Jing sewage treatment plant's outlet, and six components were acquired such as the hydrophilic base (HIB), hydrophilic acid (HIA), hydrophilic neutral substance (HIN), hydrophobic base (HOB), hydrophobic acid (HOA) and hydrophobic neutral substance (HON). Mathematical methods such as DOMFluor, PARAFAC and PAC projection approach were used to decompose the EEM fluorescene spectra of the former five components and those of the original effluents, and three principal components, i.e. the protein-like, fulvic-like and humic-like substances, were acquired. According to the analysis result of Fourier Tranform Infrared (FTIR) spectroscopy, hydrophilic substances were mainly composed by polysaccharides, proteins, phosphate, etc. On the other hand, hydrophobic substances were mainly composed by lipids, organic acids and so on. In addition, the principal components scores were compared which were decomposed from the EEM fluorescence spectra of the upstream and downstream samples from the Er Shi Bu river. Results show that the receiving waters was seriously polluted and the effluents from sewage treatment plants had little effect on the receiving waterbody.