Transumbilical single-port foreign body-free laparoscopic surgery is more difficult to perform than conventional laparoscopic surgery, due to the fact that the laparoscope and various instruments enter the abdominal cavity almost parallel to each other under single-port conditions, resulting in a series of operational difficulties. First, it is manifested by the linear field of view of the operation, so that the operator’s judgment of the distance and depth becomes somewhat difficult during the operation. This is difficult to experience during conventional laparoscopic surgery and requires more caution during surgery. Second, during transumbilical single-port laparoscopy, the instruments enter the abdominal cavity through the single port and cannot form a triangle in the abdominal cavity, which is not conducive to organ retraction and visualization, while the surgical instruments tend to interfere with each other and seriously affect the operation. Therefore, the operation should be considered to make the operating instruments face different angles of operation as much as possible to avoid mutual interference. Third, interference of extra-abdominal instruments in transumbilical single-port laparoscopic surgery is also an important factor affecting the operation. Therefore, it is better to use a Trocar with a smaller diameter at the flap site, with more Trocar entering the abdominal cavity at the main operating hole and less Trocar entering the abdominal cavity at the laparoscopic observation hole, so that the three Trocar flap parts form a three-dimensional misalignment, which increases the operating space during surgery and is conducive to a smooth operation. In the process of exploring transumbilical single-port laparoscopic surgery, we have created the original laparoscopic single-port technique of “double Trocar with three operating instruments”, which successfully overcomes the problem of interference of extra-abdominal instruments seriously affecting the operation and makes the single-port laparoscopic surgery technique much less difficult.