Based on the vagueness and imprecision of assessment system of water environmental health risk

the triangular fuzzy number theory was utilized to denote the health risk.On the basis of defining the parameters in traditional certain models as triangular fuzzy numbers

uncertain models with triangular fuzzy parameters were established.According to these fuzzy models

the membership functions of risk can be obtained directly.As a case

these new models were used to assess the environmental health risk of a certain water area of Anhui province in Huaihe River.Its total risks

corresponding to gene and non-gene toxic substances

were equal to(2.701×10-5

7.760×10-5

20.185×10-5) a-1 and(0.463×10-8

1.425×10-8

4.147×10-8) a-1

respectively.Study result shows that the fuzzy models more scientifically reveal the health risk state of a studied water environment than the traditional ones.