Objective To use the Bariatric Analysis and Reporting Outcome System (BAROS) questionnaire and to evaluate the effect of bariatric and metabolic surgery (BMS) on obese patients. Methods A total of 105 patients with BMS were enrolled and stratified into 4 groups according to postoperative duration: 3-12 months (n=40), 13-36 months (n=38), 37-60 months (n=16) and >61 months (n=11). The Chinese version of BAROS was used to evaluate the results of operation including percentage of excess weight loss (%EWL), improvement of co-morbidities associated with obesity, quality of life (QOL), postoperative complications and reoperation. Results All patients completed BAROS questionnaire and were followed-up with duration of (26.26±25.51) (3-114) months. Postoperative body mass index decreased significantly compared with those preoperative in all groups (P<0.001). %EWL of patients in group 3-12 months was 57.3%±17.6%, and 83.5%±11.4% in group 13-36 months, 84.9%±8.2% in group 37-60 months and 88.2%±8.9% in group >61 months (P<0.001). The co-morbidities with obese improved significantly and remission rate was 69.77% in cases with type 2 diabetes, 98.15% in cases with hyperlipidemia. Mean score of QOL was (1.59±0.49). QOL was evaluated good and very good in 86.70% cases without any case evaluated as poor or very poor. Difference in QOL(%) among all groups was not statistically significant( χ²=7.506, P=0.277). There were 18 cases with complications and one case had reoperation. Evaluation of operative results using BAROS score showed 89.6% cases as excellent and good and no case as failure of operation. There was no statistically significant difference among groups ( χ²=6.682, P=0.670). Conclusions BAROS can be used to analyze the effect of BMS and the results of short-term and middle/long term in this study were encouraged.