<qa>  What is the purpose of the study?Conventional hand-stitching colostomy involves extensive hand-stitching by the surgeon. There are significant variations in the outcome of surgery due to differences in the suture techniques of surgeons. The use of a circular stapler in colostomy seems more rapid and efficient colostomy than the conventional methods.But all those reports are single center retrospective cohort study,no randomized controlled trials have been carried out so far.The aim of this study is to comparing the safety and efficiency of circular stapler-assisted colostomy with conventional hand-stitching colostomy in patients with colorectal carcinoma. 