Abstract: Objective To examine the mental health and correlation factors of normal late trimester of pregnant females.Methods Self-rating Depression Scale(SDS)and Self-rating Anxiety Scale(SAS)and Social Support Rating Scale (SSRS)and self made "pregnant females psychologic factors questionnaire" assessments were administered to 310 pregnant women during their third pregnant trimester.Results The mean score of SAS(47.26±4.63),SDS(46.33±4.90)of subjects were higher than those of Chinese female norm.The score of SSRS(40.13±2.78)and different criteria were high related to the mental health status of pregnant females.Results of multiple regression analysis showed that worrying about the safe of accouchement,familily genetic disease and low social support were important risk factors of anxious symptom and depressive symptom.Conclusion Good physical and mental health of pregnant females is related to not only adjustment of self mental status,but also support and help from husband and relatives.