Prevention of postoperative edema of mixed hemorrhoids is discussed. METHODS: By paying attention to the surgical technique and gentle operation when performing mixed hemorrhoid surgery, delaying defecation after surgery and applying antibiotics appropriately, and using herbal fumigation and saline gauze wet compresses for the appearance of edema. RESULTS: The incidence of anal edge edema was significantly reduced. Conclusion: When treating mixed hemorrhoids surgically, if the above points are paid attention to, it has a positive effect on preventing postoperative edema and promoting wound healing. Mixed hemorrhoid is a common and frequent disease in anorectology, and anal edge edema has the highest incidence after mixed hemorrhoid surgery. After many years of clinical practice, we have gained rich experience and report our experience as follows: 1. Etiology: Anal edge edema is a symptom of swelling, congestion, bulging or causing swelling, pain, connective tissue proliferation and local mutation of the anal canal and anal edge skin. Generally, it is divided into two categories: congestive edema and inflammatory edema. In clinical work, both often exist at the same time, and the causes are mostly as follows: 1.1. Circulatory disorders at the trauma margin: the original venous and lymphatic circulation pathways at the trauma margin are destroyed due to surgery, or the trauma surface is compressed too tightly, and local circulation is obstructed and tissue fluid is retained, which is the primary factor of postoperative anal swelling. In addition, premature squatting and stooling or dry stool after surgery can cause or aggravate edema. 1.2, local inflammation: mostly due to poor surgical disinfection and poor postoperative drainage, resulting in infection of the wound and swelling of the local inflammation. 1.3, surgical trauma provocation: resulting in residual hemorrhoid nuclei and skin bridge edema. 2, prevention and treatment methods: 2.1, first of all, operate as gently as possible during surgery, avoid clamping the healthy tissues at the trauma edge, handle the skin flap correctly, avoid pulling and squeezing the anal or anal canal skin to reduce tissue damage. 2.2. Pay attention to the surgical operation techniques. First of all, if local anesthesia is adopted, attention should be paid to pushing the drug slowly, so that the drug is evenly distributed and the injection site is not too shallow; the surgical incision should be “V” shaped with the tip outward, the edge of the incision is neat and the incision is well aligned after surgery, and the tip of the “V” shaped incision should be extended outward by about 0.5-1 The venous plexus inside the “V” shaped incision should be removed completely, and the venous plexus under the skin bridge left between the two incisions should also be removed as much as possible, and pressure bandage should be added after the operation to make the skin bridge or the wound edge adhere to the deep tissue to accelerate the establishment of new circulatory pathways, and for the obvious loose skin bridge, skin bridge shortening can be used. In addition, from the practical experience that the edges of fistula and fissure are rarely edematous after surgery, the reason for this is closely related to the fact that these surgeries cut off the internal anal sphincter to avoid local circulatory disorders resulting from spasm of the anal canal. Therefore, cutting off the internal sphincter has a positive effect on reducing postoperative swelling and pain. 2.3. Delay defecation as much as possible after surgery, avoid prolonged squatting, and actively treat constipation and diarrhea. 2.4. Appropriate application of antibiotics, attention to local cleaning of the anus, and regular drug changes after surgery can prevent inflammatory edema caused by traumatic infection. 2.5. For those who have edema, no treatment is needed for mild cases, which can be absorbed in about 7 days; for severe cases or those who cannot be completely absorbed, treatment methods such as external application of hypertonic saline gauze, Chinese medicine fumigation and physiotherapy can be used; if combined with thrombosis, incision and decompression should be made to remove the thrombotic block. After many years of clinical practice, we believe that the surgical treatment of mixed hemorrhoids, such as attention to the above points, has a positive effect on preventing postoperative edema.