Objective To explore the relationship between dispositional optimism,family factors and mental health.Methods A total of 232 postgraduate students were assessed with Dispositional Optimism Questionnaire,Life Satisfaction Questionnaire and Depression Scale.Results ①Family economics did not influence postgraduate students' optimism and pessimism(F=0.082,P=0.970;F=0.517,P=0.671).②Life satisfaction and depression had difference in family economics(F=7.182,P0.001;F=5.217,P=0.002).③The optimism factor could significantly predict life satisfac...