Objective To know about the breastfeeding patterns of infants within 1 year old,and to investigate its influencing factors and maternal-infantile satisfaction,so as to provide scientific evidence for promoting breastfeeding. Methods Infants under one year old receiving breastfeeding in the Department of Child Health Care,Children′s Hospital of Chongqing Medical University were enrolled in this study from July to August in 2018.And a self-designed questionnaire and the Maternal Breastfeeding Evaluation Scale were filled out by mothers of infants.The current situation and influencing factors of breast milk expression,as well as maternal-infantile satisfaction under different breastfeeding patterns were analyzed. Results Totally 240 valid questionnaires were collected.And 95(39.6%) were totally or partially fed by expressed breastmilk,among which 82.1% were due to working factors.Also,39.6% of 240 participants were in support of breast milk expression,while 13.3% were against,and 47.1% thought that direct feeding and breast milk expression were both acceptable.Mothers with longer time for commuting (OR=1.893,95%CI:1.139-3.146),and with less involvement in infant care (OR=0.256,95%CI:0.112-0.583) were more likely to choose breast milk expression.There were no significant differences on the total score and the score of three subscales of Maternal Breastfeeding Evaluation Scale between direct feeding group and breast milk expression group(P＞0.05). Conclusions Breast milk expression is common and is widely supported by lactating women.Returning to work is the main reason for breast milk expression.And feeding infants expressed breast milk does not impact maternal-infantile satisfaction.