Objective To explore the risk factors of subglottic secretion retention in patients with tracheal intubation by bedside ultrasound. Methods We selected 200 critically ill patients with tracheal intubation in ICU from January to June 2023. The ultrasound was used to distinguish the patients with retained subglottic secretions or not. The influencing factors of subglottic secretion retention in patients with tracheal intubation were analyzed by univariate factor analysis，and the high-risk factors of subglottic secretion retention in patients with tracheal intubation were analyzed by binary Logistic regression. Results Among the 200 patients with tracheal intubation， 106 patients had subglottic secretions retention，accounting for 53%. Univariate statistical analysis showed that age， intubation days，intubation material，the proportion of tracheal intubation with subglottic suction，indwelling gastrictube，8 mm tracheal intubation and the disease type proportion of patients without general anesthesia operation were the influencing factors of subglottic secretion retention. Logistic regression analysis showed that only age （OR=0.699） and indwelling gastric tube （OR=2.499） were the risk factors of subglottic secretion retention. Conclusion Bedside ultrasound has certain application value in the exploration of subglottic secretion in patients with tracheal intubation，age and indwelling gastric tube are independent risk factors for subglottic secretion retention，which provided theoretical reference for clinical nurses to strengthen airway management.