To evaluate the feasibility of method of bedside ultrasound to confirm correct nasointestinal tube placement of critical patients.From June 2015 to February 2016 , a total of 70 patients admitted to Emergency Intensive Care Unit, Zhejiang Provincial People's Hospital, 37 males and 33 females, using bedside ultrasound(vessels signe) to confirm the location of nasointestinal tube at different site of digestive tract, and then comparing with the traditional methods, the point-of-care systems.Auscultatory method and aspirates from tube method have lower sensitivity(78.6%, 72.7%) and specificity (25.0%, 75.0%) ; bedside ultrasound(vessels signe) method sensitivity (100%), accuracy (100%) , positive predictive value(100%), negative predictive value(100%) and precision ratio are all higher than auscultatory method and aspirates from tube method, the difference was statistically significant(P<0.05).The bedside ultrasound vessels signe method has more advantages in confirming the location of the tubes at sensitivity , accuracy , specificity and positive predictive value than the traditional methods.