Poorly dilated rectal anastomosis is generally defined as a narrowing of the anastomosis after rectal surgery. During rectal surgery, it is sometimes necessary to remove part of the rectal tissue and then anastomose the remaining rectum. If the anastomosis is ischemic, infected, etc., it will lead to local anastomotic stenosis, which is commonly referred to as poorly dilated rectal anastomosis. When there is the manifestation of rectal anastomotic stenosis, the built-in rectal stent can be used to dilate the stenosis area, and for the more serious stenosis area, a second surgical treatment can also be considered, so as to promote the growth and recovery of the rectal anastomosis. When anastomotic stenosis occurs after rectal surgery, it is likely to produce persistent abdominal pain and also affect the normal function of the rectum. When this condition is found in the review, it is important to seek medical treatment as soon as possible to give reasonable treatment in order to have a better prognosis.