Laparoscopic surgery has a hundred-year history, and in the last decade, with the popularization of the concept of minimally invasive surgery, the development of laparoscopic surgery has advanced rapidly, and in many aspects laparoscopic surgery has even replaced traditional open surgery as the gold standard of surgery. In recent years, laparoscopic gastrointestinal surgery has also been widely recognized, and surgical techniques have been improved and gradually standardized. While people pay attention to the technical standardization and improvement of laparoscopic gastrointestinal surgery, few people pay attention to another important role in laparoscopic surgery – the mirror holder. The success of laparoscopic surgery is directly related to the success or failure of the operation, because the operator loses the sense of touch in laparoscopic surgery and is replaced by a higher requirement for clear vision. Years of laparoscopic gastrointestinal surgery experience let us conclude that to support the laparoscope must pay attention to the following eight points: First, the word bubble: the development of laparoscopy from ordinary lens to high-definition lens to reflect to us the pursuit of the operator’s clear surgical field. A clear operative field can not only make the operator happy, but also enhance the operator’s visual discrimination and reduce the occurrence of intraoperative complications. There are many factors that influence the desire to obtain a longer-lasting clear field, but the preoperative treatment of the lens is particularly important. For this reason, many approaches have been tried such as: iodine wipe lens, retinal contact lens, etc., all with unsatisfactory results. We believe that the preoperative soaking of the lens in hot water at 60-70°C has the best effect, and the temperature of the water used to soak the lens throughout the procedure should be kept at about 60°C. The first soaking lens is the most important, the time should be slightly longer, about 1 minute, so that the lens is fully preheated, higher than the temperature in the abdominal cavity, after each time the lens is molded soaking time can be just a few seconds. Second, the word wipe: after the end of the lens soak will need to wipe, wipe material can choose soft sterile gauze. Wipe the order of the mirror for the first body after the mirror, wipe the mirror with a little force, repeatedly wipe 2-3 sides, be sure to make the mirror without residual water droplets and water mist. The entire wiping action should be as rapid as possible, so that the lens as soon as possible into the abdominal cavity, to avoid the lens temperature cooling, so that the lens is not easy to fog, a longer period of time to maintain a clear surgical field. Third, in the word: a good hand to hold the mirror is like a good photographer, must present a beautiful and harmonious picture to the operator. What kind of picture is considered harmonious? For laparoscopic surgery, a harmonious picture can be formed when the target to be observed by the operator is placed in the center of the monitor or the “golden point”, which is pleasing to the operator’s eyes. Any observation of the corner or edge of the monitor will make people feel uncomfortable and feel that the observation of the target is not comprehensive and the operation is not exact and safe. Fourth, the word in: keeping the laparoscope base flat and the observation target square is a horizontal adjustment of the operative field, while the in and out of the laparoscope is an adjustment of the longitudinal depth of the operative field. As the laparoscope gets closer to the observation target, the target will be further magnified and the more clearly the details of the operation will be observed, for example, in the nudging of vessels it is necessary to keep the lens close to the observation target to avoid damaging the vessels when opening the vascular sheath, especially important in the nudging of venous vessels. Close observation of the target is best to keep the surgical field to be observed accounting for about 1/4-1/5 area of the monitor, too close will make the focal length of the laparoscope can not be adjusted clearly, the ultrasonic knife operation is easy to make the lens fogging, affecting the observation effect. Fifth, the word receding: laparoscopic receding observation is mainly used in three situations. First, it is necessary to keep the laparoscope away from the operative field when making large adjustments to the operative field, so that the observation range is enlarged and it is easy for the operator and the assistant to adjust simultaneously under direct vision, which increases the accuracy of adjustment and shortens the adjustment time. Secondly, when the surgical field is cleared at the end of surgery, the wide observation at this time can strengthen the operator’s overall grasp of the surgical field and avoid the omission of active bleeding in the surgical field and other conditions. Thirdly, when the ultrasonic knife is free of organs containing large amounts of water such as the greater omentum and the mesentery of obese patients, it may produce a large water mist or even splashing droplets, which can keep the laparoscope away from the target at this time to keep the laparoscope clear and reduce the number of bubble mirrors or wiping mirrors to make the surgical process more fluid. Sixth, the word “spin”: the emergence of the word “spin” from the birth of the 30 ° laparoscope, the so-called “spin” is to help the mirror hand on the 30 ° laparoscope on the use of fiber optics, it allows the laparoscope to achieve three-dimensional observation of the target, so that laparoscopic gastrointestinal surgery, especially gastrointestinal tumor surgery is possible. The 30° laparoscopic fiber optic is deflected to the right if the lens is left, to the left if the lens is right, and up if the fiber optic is rotated 180°. During laparoscopic gastrointestinal surgery, the rotation function of the fiber optic is generally used in four situations: 1, for the freeing of blood vessels, it is necessary to observe from different sides of the vessels and fully open the vascular sheath in order to achieve the nudity of the vessels. 2, in the low rectal free, need to do “posterior pointing, bilateral encirclement, anterior rendezvous”, three-dimensional observation of the rectal circumference must be achieved through the reasonable rotation of the fiber, for example, free pre-sacral observation of the posterior wall of the rectum must be rotated 180 ° fiber, otherwise it will not be observed. 3.When the direction of the lens is the same as the direction of the main instrumentation, to observe the work of the head end of the instrumentation to avoid collateral damage it is necessary to properly rotate the fiber. 4.When placing the poke card at the beginning of the surgery and checking the poke card hole after the surgery, the fiber must be rotated in order to observe exactly whether there is any organ damage caused by the poke card or abdominal wall bleeding caused by the puncture of the poke card. Except for the above four and some other rare cases that require rotation of the fiber, a more ideal operative field can be obtained most of the time during surgery by keeping the fiber in place. Sixth, the word “follow”: laparoscopic hand is always at the service of the main knife, is the eye of the main knife, the degree of tacit understanding between the two can be reflected from a “follow” word. The eyes are governed by the brain, and there is only one brain on the operating table, that is, the brain of the main surgeon. Both the supporting hand and the assistant must think what the main surgeon thinks and keep in line with the main surgeon at all times, so that the cooperation is tacit and the surgery is smooth. Therefore, the helper can not only do the main knife to see which, but to have foresight, so that the lens to the main knife to move to the next surgical field, which is essential to increase the coherence of the main knife action. Seven, the word flat: the lens into the abdominal cavity after the hand for laparoscopic operation is mainly focused on the base of the laparoscope and fiber optics. The laparoscope base flat is the basis for getting the correct operative field. Nowadays, most doctors engaged in laparoscopic gastrointestinal surgery have rich experience in open surgery, so the so-called laparoscopic base flattening means that the observation angle of the laparoscope should be in accordance with the open habit. For different surgeries, we can choose different references to adjust the laparoscope base: to ensure the level of the liver and pancreas for upper abdominal surgery; to ensure the level of the uterus or bladder for pelvic surgery; to ensure the level of the abdominal aorta when freeing the inferior mesenteric vessels; to ensure the vertical of the superior mesenteric vein when freeing the right hemicolectomy vessels, etc. Pay attention to these references can make the laparoscopic base adjustment more quickly and accurately. Eight, follow the word: to help the mirror hand in the word “follow” and the main knife to do the heart to think in one place must let the mirror hand in repeatedly watch the premise of the main knife surgery video fixed with long-term training. It is believed that any support surgeon can do it, but no fixed pairing can produce good support surgeons. Laparoscopic surgery is a team effort and the importance of the supporting hand is something that every laparoscopic surgeon can deeply appreciate, but few laparoscopic surgeons pay attention to the training of the supporting hand. In our opinion, there are many skills in holding the mirror for laparoscopic surgery, which can only be mastered and improved through repeated training practice and continuous summary, and only then can the visual advantages of laparoscopy be fully utilized to help the surgeon complete each laparoscopic surgery safely and smoothly.