Eutrophication of a lake is one of environmental problems in the world.Mathematic modeling of eutrophication plays an im portant role in managing and controlling the Phenomenon.Among different types of eutrophication modeling,the related modeling of phytoplankton and nutrients has good applicability because the relationship between nutrients and eutriphication can be easily monitored. This paper discusses the appocation of the modeling,and analyzes the relationship between chlorophyll a and the TP,TN and COD,C,r, according to the observation data of the Nasi Lake ,and strong relations were found by regression analysis.