Objective:To investigate the relationship among mental health,maternal negative emotion and mother-child attachment in preschoolers.Methods:A total of 591 mothers of preschoolers from 8 kindergartens were selected.The Preschoolers Mental Health Scale(PMHS)was used to evaluate mental health of the preschool-ers,the Self-rating Depression Scale(SDS)and Self-rating Anxiety Scale(SAS)were used to evaluate maternal negative emotions,and Maternal Object Relationship Scale-Short Form(MORS)was used to evaluate mother-child attachment.Results:The scores of SDS and SAS were positively correlated with the total scoresand scores of each dimension of PMHS(r=0.69-0.93,Ps＜0.001).The maternal SDS and SAS scores were positively associated with total PMHS scores(β=0.38,0.52).The products of maternal SAS scores and MORS scores were negatively associated with the total PMHS scores(β=-0.12).Conclusion:Preschoolers mental health is closely related to a maternal negative emotion and mother-child attachment.