Objective To study the nutritional status and influencing factors of children aged 1-36 months in Naqu People′s Hospital of Tibet Autonomous Region of China,and to provide reference for further improvement of their physical quality and health level.Methods The infants and young children hospitalized from January 2015 to December 2016 were enrolled in the study.The basic information were collected,which included gender,age,weight,height,diseases,feeding patterns,adding supplementary time,etc.The Z-score of the indicators for the growth and development of children recommended by WHO were evaluated,and the children′s malnutrition status and its influencing factors were analyzed.Results A total of 1 371 infants were included in the study,which included 753 male infants and 618 females,with a ratio of 1.2 to 1.The rates of growth retardation,low weight and weight loss were 25.31%(347 cases),18.75%(257 cases) and 6.13%(84 cases),respectively.There was no significant difference in the incidence of growth retardation,low body weight and weight loss among infants and young children with different months of age (1 to 6 months,7 to 12 months,13 to 24 months,25 to 36 months).The feeding mode and the time of addition of the supplemen-tary food (tsamba paste) had a significant effect on the incidence of malnutrition in infants less than 6 months old.The incidence of malnutrition in infants with exclusive breastfeeding was lowest (28.88%,93/322).The earlier the tsamba paste was added,the higher the incidence of malnutrition.Conclusion The in-cidence of malnutrition in infants and young children in Naqu People′s Hospital is high.Correct feeding con-cept should be paid attention to.Early breastfeeding and adding supplementary food rationally for infants and young children are very important,which is beneficial to promote their nutritional status and improve the health.