Abstract: Objective To study social support status and its influencing factors among quasi-migrants in Danjiang-kou reservoir area and to provide guidance for the late resettlement of the migrants.Methods Stratified multi-stage cluster sampling method was used in this study.We used a basic questionnaire,Symptom Checklist-90(SCL-90)and Social Support Rating Scale(SSRS)to investigate 575 quasi-migrants and 564 non-migrants in Xichuan county.Results We found that the quasi-migrants got higher scores in the objective support(8.65±2.37)than the non-migrants(7.72±3.02) and got lower scores in subjective support(21.37±5.00)as well as SSRS total score(36.95±6.90)than the non-migrants(22.48±4.74 and 37.42±7.03),and the differences were statistically significant(P<0.01).The multiple linearity regression model revealed that gender,education level,and local security situation were positively correlated with SSRS total score(β=1.189,1.088,1.093);unmarrtied and bad neighborhood relations were negatively correlated with SRSS total score(β=-1.684,-1.935).Among the quasi-migrants,the SCL-90 scores for somatization,obsessive-compulsive symptoms,interpersonal sensitivity,depression,anxiety,hostility,phobia,paranoid,psychosis,and total score were 1.32±0.45,1.24±0.31,1.12±0.22,1.15±0.26,1.15±0.29,1.15±0.25,1.13±0.31,1.10±0.23,1.10±0.21,and 1.18±0.25,respectively.The subjective support score was negatively correlatd with the SCL-90 scores for somatization,obsessive-compulsive symptoms,interpersonal sensitivity,depression,anxiety,hostility,psychosis,and total score(P<0.05 for all).And the score of social support utilization was positively correlated with somatization,anxiety,hostility,phobia,psychosis,and total score(P<0.05 for all).Social support score was negatively correlated with somatization score(r=-0.084,P<0.05).Conclusion Quasi-migrants got a lower score of social support.Gender,education level,marital status,relation with neighbors,and the local security situation are influencing factors of social support.