Huizhou West Lake,a famous 4 A scenery in Guangdong province,is a subtropical shallow urban lake.Based on the survey data and the assumption that Huizhou West Lake is a well-mixed lake,a zero-dimension total phosphorus equilibrium model of Huizhou West Lake was established in this paper.The model was used to simulate the concentration of Total Phosphorus in Huizhou West Lake,from Oct.2003 to Sep.2004.The result showed that the model is applicable and feasible in the water quality study of Huizhou West Lake.The error was within the range of allowed.Moreover,an advanced model was developed based on the sediment phosphorus releasing rate.This advanced model can simulate the tendency of total phosphorus concentration of Huizhou West Lake more precisely.