Abstract: The contamination level of nitrate and nitrite of main vegetables collected from six vegetable markets in Hefei was investigated and evaluated. The results showed that The contents of nitrate in vegetables varied significantly with different kinds of vegetables,i.e.,leaf vegetables>legumes>root vegetables>egg plants>gourds,52.9 percent of the investigated vegetables were contaminated slightly,35.3 percent of the vegetables were contaminated moderately and 11.8 percent of them were contaminated heavily. The contents of nitrite in all investigated vegetables were lower than the hygienical criterion and the order of contents of nitrite was leaf vegetables>legumes> egg plants>gourds >root vegetables ;The contents of nitrate and nitrite in leaves of same vegetable were higher than that was in petioles.