Abstract: Objective To investigate the state of sex activity of residents dwelling in tent afterearthquake and analyze the relationship between sex activity and anxiety.Methods Cluster random sampling method was adopted.The condition of sex behavior was inquired face to face.The state of anxiety was examined by SAS questionnaire and the subjects with the score more than 50 was considered as anxious.Excel and SPSS 11.0 software were used to analyze the data.Results 107 of 284 people in the study admitted the sex experience.The proportion of anxiety in the subjects with sex experience was 14.96% (16/107).However,in the subjects without sex activity,the proportion was 261 56% (47/177).There was a significant correlation between the two groups(χ²=5.20,P=0102,OR=0.49,OR 95% CI=0126~0.91).The tendency Chi square test also showed a significant correlation between sex activity and anxiety degree(χ²=7184,P=01049).The proportion of anx iety showed signficant difference between the group with sex activity and the group without sex activity in the female(χ²=61 15,P=0.01)and the 40~49 aged group(χ²=4.53,P=0.03).Conclusion After the earthquake,sex activity occured in the people dwelling in tents.Proper sex activity is helpful to release anxiey.Close attention should be paid to the sex activity of female and 40~49 aged group refugees afterearthquake.