The water quality of surface water in Huadu District of Guangzhou has been assessed comprehensively based on the environmental investigation and monitoring in order to provide the scientific basis for the pollution treatment in the Huadu District.This paper discussed the choice of the evaluated factors,the operations of the weight value,and compares with the status of the water quality in the course of the evaluation.The conclusions indicated that the result of the fuzzy mathematics evaluation represented the water quality of surface water in Huadu District.The water quality of the Huadu District is above satisfactory level,as it exceeded the water quality of class Ⅲ.But the emission of the industry plants has a detrimental effect on the surface water.There is oil and organic pollution near to the Tianma River,the water quality belonged to class Ⅴ.