Objective To survey the diet quality of UC patients using Chinese diet balance index(DBI-07) and explore their relationship with nutritional index and activity of disease, thereby to provide evidences of nutritional therapy for UC patients. Methods 82 adult UC patients who met the inclusion criteria were included in our study. They were investigated with food frequency questionnaires(FFQ) and diet quality was assessed with DBI-07. Anthropometric measurement and blood examinations were done. Data were analyzed with SPSS 17 software. Results 68.3% of the UC patients loss their weight during the recent 6 months. 40.2% of the patients were found hypoalbuminemia and 34.1% were complicated with anemia. The mean TS,LBS and DQD were -20.02±7.97, -22.15±6.78 and 24.27±6.21 respectively. Percentage of patients in slightly or moderately deficit of food intake were 54.9% and 37.8%. Percentage of the UC patients in slightly or moderately dietary imbalance were 80.5% and 17.1%.The absolute value of LBS and DQD were negatively correlated with serum albumin respectively, and both of them were positively correlated with activity of UC. Conclusion Evaluating the quality of UC with DBI-07,92.7% of UC patients were in slightly or moderately deficit of food intake,97.6% were in slightly or moderately dietary imbalance. These percentages were higher than that of healthy people. It indicated that deficit of food intake is an important reason resulting in malnutrition. Nutrition therapy is essential for UC patients.