Objective To investigate the intergeneration transmission of attachment between mothers and infants and the stability from infancy to toddler age. Methods The subjects included 160 healthy infant-mother dyads.Infant-mother attachment was assessed with Ainsworth's strange situation strategy;118 infant-mother dyads were followed up in toddler age around 3 years:each mother's attachment to her own mother was assessed with Adult Attachment Interview Questionnaire (AAIQ),while each toddler's attachment was assessed with Attachment Behavior Q-set (ASQ). Results 1) 63.6% of mothers' attachment patterns were consistent with their infants' attachment patterns;The consistency between a secure mother and a secure infant was relatively high,which was 86.2%.2) Of the 118 toddlers,64.4% were rated as securely attached and 35.6% as insecurely attached.The consistency of both secure and insecure attachment from infancy to toddler age was high,which approached to 89.7% and 85.0%,respectively(χ²=0.569,P>0.05). Conclusions 1)There exists intergeneration transmission of attachment between mothers and infants,especially,a secure mother highly predicts a secure infant;2) The security of attachment keeps highly consistent and stable from infancy to toddler age.