Abstract： Objective To investigate the dietary and nutritional status and problems of a conventional submarine crew during a prolonged deployment and to provide scientific evidence for the development of food and nutritional requirements of the submarine crew. Methods The dietary survey was conducted with the accounting method, and energy consumption was calculated by using the energy balance method. Results ( 1 )The intake of pork, beef and mutton, viscera, eggs, fish, milk powder, beans and related products, sugar,vegetables, edible fungi, kelp and seaweed was low. (2) 71.1% of energy was from vegetable foods. Protein intake from animal food accounted for 50. 1% of the total protein intake, which conformed to related military standards. Fat intake from animal food accounted for 69.9% of the total, which exceeded that of the military standards. (3) The average intake of vitamin A, vitamin E and vitamin B1 was significantly lower than that of the military standards, nevertheless, cholesterol intake was significantly higher than that of the military standards. In addition, the average intake of sodium was obviously greater than the required amount.Conclusions The average daily intake of energy and most nutrients conformed to related military standards,but the intake of vitamin A, vitamin E and vitamin B1 was lower than the dietary allowances required, while cholesterol intake was too much. It was suggested that more supplies of beef and mutton, vegetables, milk,eggs, fish and other aquatic products be given to the submarine crew, and the intake of animal fat, salt and condiment be reduced.