In the 19th century, with the rise of modern industry and science and technology, surgery ushered in an important period of development. Especially after the middle of the 20th century, with the development of anatomy, anesthesiology, blood transfusion and microsurgery, surgery entered a stage of rapid development, and various new techniques and methods emerged continuously; however, there are still many problems that need to be solved, and how to control bleeding and stop bleeding intraoperatively is one of the important problems faced. We advocate the concept of “gap surgery” in gastrointestinal tumor surgery, where there are only loose tissues and few blood vessels and nerves in the tissue gap. The surgical operation can be performed in this gap to achieve less bleeding or even no bleeding. The thyroid gland is an organ rich in blood flow in the neck, so if we operate along the gap in thyroid surgery, we can achieve a bloodless result.