With the rapid development of science and technology, modern surgical procedures place more and more emphasis on the preservation of organ function while removing lesions, thus maximizing the quality of survival. Therefore more and more minimally invasive surgeries are gradually replacing traditional surgeries. However, for malignant tumors, complete removal of the tumor and maximum assurance of no recurrence of the tumor are still the important principles of surgery. Therefore, minimally invasive surgery for malignant tumors is also performed on the premise that it is enough to completely remove the lesion. Laryngeal cancer is one of the highly prevalent malignant tumors in the head and neck. The larynx is closely related to human vocal, swallowing and breathing functions. While removing laryngeal tumor, the vocal, breathing and swallowing functions of the larynx will be affected differently, therefore, after laryngeal cancer surgery, nasal feeding diet, tracheotomy and inability to vocalize are the most common results. It has a great impact on the quality of life of patients. It would be the greatest blessing for patients if the vocal, respiratory and swallowing functions can be preserved while the tumor is removed, which will maximize the quality of life of patients. The laryngeal function preservation problem of early stage laryngeal cancer has been successfully solved by the CO2 laser of Cogent, which can completely remove the tumor while preserving the function of larynx. Laser surgery has been used for more than 20 years to treat laryngeal cancer. In some developed countries, laser surgery for laryngeal cancer has accounted for 30% to 50% of all laryngeal cancer surgeries, and the trend is increasing year by year. Carbon dioxide laser surgery under microscopic support laryngoscope has the following advantages: 1. no incision in the neck, through the oral cavity, operated by support laryngoscope, with less damage in the larynx and better recovery of pronunciation function; 2. high accuracy of direct operation under microscope, which can completely remove tumor tissues; 3. because the laser can close the blood vessels and lymphatic vessels around the lesion, blocking the diffusion pathway, the surgical instruments do not touch the tumor, which reduces the shedding of tumor cells. Because the laser can close the blood vessels and lymphatic vessels around the lesion and block the diffusion pathway, the surgical instruments do not touch the tumor, which reduces the possibility of tumor cells shedding and spreading, and the recurrence and metastasis rate is low; 4.Low intraoperative bleeding, clear surgical field, and low postoperative infection rate; 5.Low postoperative reaction and almost no pain, fast healing of edema and wound. 6.Short time, less bleeding, no need to do tracheotomy. No misopharyngeal and choking cough, fast postoperative recovery, short hospitalization period, and light psychological and economic burden. Minimally invasive surgery that preserves laryngeal function maximizes the survival quality of patients, and is therefore widely used for its irreplaceable advantages.