1. Study materials  
Between September 2018 and February 2020, 120 patients underwent surgeries of laryngeal carcinoma at the Otorhinolaryngology, Head and Neck Surgery Department, ######. The research project was submitted and approved by the Ethics Committee of our hospital, and informed consents have been obtained from all patients according to the Ethics Committee.
Inclusion criteria for enrollment in the study were: (1) diagnosed as laryngeal carcinoma and classified according to the 8th Edition of the Union for International Cancer Control-American Joint Committee on Cancer (UICC-AJCC) TNM staging system;11 (2) patients who underwent partial laryngectomy; (3) evaluation of swallowing function preoperatively was normal; (4) with good pulmonary function; (5) capable to follow the program, participated in the study voluntarily and signed informed consent. Exclusion criteria were: (1) patients had nearly total laryngectomy or transoral laser microsurgery; (2) with serious intraoperative or postoperative complications.