Objective:To study the sleep quality and its influencing factors of infants and young children under 3 years old by using statistical analysis through questionnaire survey and family interviews of 162 infants and young children under 3 years old in Shenzhen.Methods:By searching and studying the literatures related to children's sleep in the past 10 years,the possible objective factors affecting children's sleep quality were screened out.The relevant data were obtained by baseline survey before and after birth,infant sleep questionnaire(BISQ)scale,and parents'interview for 20 minutes.Results:The time of watching TV(mobile phone),outdoor sports time,sleep posture and sleep location had significant effects on sleep quality.Conclusion:The study on the influencing factors of sleep quality of infants and young children has a high guiding significance for the clinical counseling of sleep problems of infants and young children,and family interview is an important way to intervene and guide the sleep problems of infants.