Objective: To explore the mediating effects of friendship quality between personality traits and loneliness in children. Methods: Questionnaire of Five-Factor Personality, Friendship Quality Questionnaire, and Children' s Loneli- ness Scale were administrated to 560 children from grade 4 to 6 in primary school. Results: (1)Significant correlations were observed between personality traits, friendship quality and loneliness. Specifically, loneliness was negatively correlated with extroversion, kindness, conscientiousness and openness, and p...