Multivariables logistic regression analysis indicated several factors associated with postnatal depression in particippants including unstable job, poor economic status, being sick in pregnancy, uexpected pregnancy, unsatisfied with gender of the baby, poor relationship with her husband, helplessness from others in caring the babies and selfcare, suffering from severe insomnia, thinking sexual relationship not so important after childbirth, decreasing sexsual desire, children often crying at night.