Total mesocolectomy（CME）and D3 radical surgery are the main surgical treatments for right colon cancer. The surgical methods are relatively uniform，but there are still some controversies between these two methods. At present，the scope of lymph node dissection is mainly controversial between CME and D3 radical resection，including the concept of CME and D3 radical resection，the medial boundary of CME and D3 lymph node dissection，and whether the subpyloric lymph node is routinely dissected. Currently，medial lymph node dissection of CME and D3 is a hot topic. Whether the left side of the superior mesenteric vein is used as the medial boundary of lymph node dissection or the left side of the superior mesenteric artery is used as the medial boundary of lymph node dissection，a unified standard has not been formed yet，which needs to be further confirmed by large-sample prospective multicenter clinical studies. The author reviewed the research status at home and abroad，combined with the practical experience of our center，and discussed the controversy of the scope of lymph node dissection in laparoscopic radical resection of right colon cancer.