Objective To know about the feature of attachment of 1 to 2-year-old infants and the effect of attachment on development quotient,and to analyze the influential factors of secure attachment,in order to help establish a good parent-child relationship.Methods Totally 200 infants were tested with Strange Situation Procedure,and their development quotient was assessed by Gesell Development Scale from January to August 2018.Questionnaires including family members′ general information,rearing patterns and Olson quality of marriage,were filled in by mothers.And Child Temperament Questionnaire was filled out by main caregivers.The development quotient of different types of infant-mother attachment was analyzed by t test,and influential factors of secure attachment were analyzed by χ² test and Logistic regression analysis. Results Among 200 infants,there were 137 infants of secure attachment,15 infants of avoidant attachment,44 infants of resistant attachment,and 4 infants of disorganized attachment (totally 63 infants with insecure attachment type).There were significant differences on development quotient between safety attachment type and insecure attachment type (t=6.327,P＜0.01).On the contrary,significant correlations were found among the duration of sleeping with parents at night,high-quality company from parents and marital satisfaction of mothers(χ²＝5.644、7.484、10.711,P<0.05). Conclusions There is a higher ratio of secure attachment among infants in this study.Development quotient of infants with secure attachment is clearly higher than infants with insecure attachment.The key factors to build secure attachment include,sleeping with parents at night,high-quality company with infants and high score of marital satisfaction.