Objective To investigate the risk factors associated with the formation of parastomal hernia after Miles operation, and to provide scientific evidence for the prevention of parastomal hernia. Methods The clinical data of 218 patients with rectal cancer who undergoing Miles operation in the Affiliated Hospital of Xuzhou Medical University between May 2011 and May 2015 were analyzed retrospectively. Fifteen possible factors affecting the occurrence of parastomal hernia were selected. The fifteen related factors were analyzed by single factor analysis and two elements logistic regression analysis. Results A total of 55 patients with parostomy hernia occurred in 218 patients during follow-up period, and the incidence of parastomal hernia was 25.23%. Univariate analysis showed that age, thickness of subcutaneous fat in abdomen, BMI, stoma pathway, and hypertension were related to the formation of parastomal hernia after Miles operation (P<0.05). Further two elements logistic regression analysis showed that, advanced age, thickness of subcutaneous fat in abdomen, BMI>25 kg/m2, and transperitoneal were independent risk factors for the formation of parastomal hernia after Miles operation (P<0.05). Conclusion For patients with risk factors, it is very important to choose optimum stoma pathway during Miles operation to avoid the occurrence of formation of parastomal hernia after Miles operation.