Objective: To investigate the Clavien-Dindo classification and risk factors for postoperative complications of laparoscopy-assisted radical gastrectomy (LAG) for gastric cancer. Methods: The data of 156 patients undergoing LAG for gastric cancer between January 2014 and November 2017 were retrospectively analyzed. The postoperative complications were stratified using the Clavien-Dindo classification system, and the risk factors for postoperative complications and the influential factors for Clavien-Dindo classification were also determined. Results: Of the 156 patients, postoperative complications occurred in 27 cases (17.3%), with Clavien-Dindo grade I in 3 cases, grade II in 15 cases, grade III in 8 cases, and grade V in 1 case, respectively. The most common complications included anastomotic fistula, intestinal obstruction and hemorrhage. The results of univariate analysis indicated that the sex, BMI, concomitant underlying diseases, ASA grade, preoperative hemoglobin level, operative time, type of surgery, the serum level of c-reactive protein (CRP) on postoperative day (POD) 3 of the patients were associated with the occurrence of postoperative complications of LAG (all P<0.05). The results of multivariate analysis demonstrated that BMI (≥25 kg/m2), anastomosis method (Billroth II and Roux-en-Y method) and CRP level on POD 3 (≥170 mg/L) were the independent risk factors for postoperative complications of LAG (all P<0.05). BMI, anastomosis method and CRP level on POD 3 were also the factors affecting the Clavien-Dindo grade of the postoperative complications of the patients (all P<0.05). Conclusion: The postoperative complications of LAG are Clavien-Dindo grade II, and the BMI, anastomosis method and CRP on POD 3 are important factors for the postoperative complications of LAG and their severities.