Three cases had symptoms such as laryngeal wheezing, dyspnea, backward growth and development, etc. After electroniclaryngoscopy, the first case was diagnosed with laryngeal softening (severe, type Ⅱ), and the angular incision was performed. While cases 2, 3 diagnosed with case 2 and 3 were diagnosed with laryngeal cyst and underwent laryngeal cyst resection. All three cases underwent low-temperatureplasmasurgery under visual laryngoscope, and the symptoms were relieved after operation. Case 4 was laryngeal wheezing and dyspnea after extubation under general anesthesia. The electroniclaryngoscopy showeded early stage of globetic stenosis, and endoscopic pseudomembrane clamping was performed, and the postoperative symptoms were relieved.