Objective To investigate clinical characteristics and risk factors of postoperative relatively serious complications in early gastric cancer (EGC). Methods Totally 114 early gastric cancer patients confirmed by postoperative pathology in the First Affiliated Hospital of Nanchang University from March 2016 to March 2017 were enrolled in this study. The patients were divided into complication group (16 cases) and no complication group (98 cases) according to whether or not there were postoperative relatively serious postoperative complications. Univariate analysis was performed on the various clinical indicators and related indicators of complications in patients with early gastric cancer, and the independent risk factors were determined by Logistic regression analysis. Results The incidence of EGC is 1.92:1.00 in men and women; the mean age of patients with postoperative complications was greater than that of patients without complications (P < 0.05); univariate analysis revealed that age and preoperative hypertension were risk factors of relative serious complications for the early gastric cancer (P < 0.05); multivariate Logistic regression analysis revealed that age was independent risk factors of postoperative relative serious complications for the early gastric cancer (P < 0.05). Conclusions Patients with early gastric cancer who are over 60 years or have hypertensive have high risk of relatively severe complications.