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Abstract Introduction: Child-mothers Primary relationship is the base of next relationship in adulthood. for a health interpersonal relationship trust is an important factor.researchers emphasize on mother-child relationship in infancy & show that individual mental health/disease in adulthood affected by Child-mothers Primary relationship.and this effect communication styles & trust in interpersonal relationship in adulthood.hence this study aimed to investigation of relationship between attachment, Nutrition type ,( Breastfeeding , dry milk)weaning style (suddenly or gradual)with communication styles interpersonal trust in adulthood. Materials and Methods: sample of this study includes 180 case(95 men & 90 women)aged 16-26 years that filled attachment styles, communication styles & interpersonal trust questionnaire information about , Nutrition type & weaning style gathered from an oral interview of their mother Findings: Nutrition type & weaning styles didn’t have any significant relation with communication styles & interpersonal trust . there is a significant relationship between gender , Battler communication style & interpersonal trust(p<0.05). there is not significant relation ship between attachment styles and communication styles but there was a significant relationship between attachment styles & interpersonal trust(p=0.00). Discussion &Conclusion: attachment styles have a significant relationship with communication styles & interpersonal trust.hence mothers education about response their children needs can be an important act in formulation the health interpersonal relationship in adulthood.