Objective To investigate the feasibility of inserting and detaining nasointestinal feeding tube in small bowl guided by bedside ultrasound(US)in critically illelderlypatients.Methods This was a retrospective study.Sixty four agedpatients(≥ 60 years)in general ICU,the Second Affiliated Hospital of Jiaxing College,received the US-guided nasointestinal feeding tubes inserting and detaining.Feeding tubes passed through nasal and went into the stomach by manual blind method.Under US-guiding condition,the tube passed through the pyloric sphincter and further into the duodenum or jejunum.Finally the correct position of the tube head was assessed by bedside X-ray examination.Results The US-guided nasointestinal feeding tube-detaining technique was successfully operated in 57 patients(89.1%).The feeding tube heads were in the duodenum in thirty four cases(53.1 %),and in proximal jejunum in twenty-three cases(35.9%).The untoward reaction included the bleeding of nasal cavity in 1 case,and hypotension in another case.Conclusions Bedside US-guided nasointestinal feeding tube placement is safe and feasible in aged critical patients.