Six kinds of nitrogen- enriched intracellular and extracellular algae organic matters of Microcystic aerugi-nosa with different characteristics were obtained via the fractionation electrodialysis of hydrophilic and hydrophobiccomponents,with the mass concentrations of dissolved organic nitrogen (DON) ranging from 0.57 to 1.69 mg/L.Then,the 3D fluorescence spectrography was adopted to analyze the composition of hydrophilic and hydrophobiccomponents,finding that the former was mainly composed of humus- like substances and the latter mainly composedof protein.Afterwards,the formation characteristics of carbonaceous (nitrogenous) disinfection byproducts fromdifferent organic matters were analyzed and compared after a 3- day chlorination.The results show that (1) hydro-phobic intracellular and extracellular organic matters are of maximum trihalide methane formation potential,espe-cially for chloroform; (2) there is a significant correlation between haloketone formation potential and intracellularand extracellular organic matters; (3) the hydrophilic component in intracellular organic matters is of the greatestnitrogenous disinfection by- products formation potential (DBPFP); (4) the disinfection by- products formation po-tential of each component is not only determined by the value of DOC/DON (namely the mass concentration ratio ofdissolved organic carbon to DON) but also by the characteristics of DON; (5) the DBPFP of extracellular organicmatters is positively correlated with the content of aromatic organic materials,while that of intracellular organic mat-ters is mainly influenced by the properties of aromatic organic materials; and (6) the disinfection by- products pro-duced by extracellular organic matters are in a content order of hydrophobic by- products ＞ hydrophilic by- products＞ transphilic by- products,while those produced by intracellular matters are indicative of the following order: hy-drophilic by- products ＞ hydrophobic by- products ＞ transphilic by- products.