Objective: To explore the relation between parental cohesion, peer acceptance and the loneliness of left-behind children, and furthermore explore the mediation role of self-esteem. Methods: Totally 427 left-behind children in Hubei Province (275 males,152 females) were surveyed, and the Parental Cohesion Scale (PCS), Peer Nomination(PN), Self-Esteem Scale (SES) and Children LonelineSs Scale (CLS) were used to assess parental cohesion, peer acceptance, self-esteem and loneliness respectively. The relation between parental cohesion, p...