Objective:To find out factors related to the delay in diagnosis of panic disorder. Methods: One hundred patients with panic disorder were assessed and investigated with SCL-90 and a self-compiled questionnaire.Linear regression was applied in the multivariate statistical analysis,with the delayed time (from the age at onset to the age at being definitely diagnosed) as dependent variable and SCL-90 factorial scores, the existing symptoms and the demographic factors as independent variables. Results:Factors negatively correlated with the delayed time were depression ,nausea/abdominal discomfort and fear of dying while those positively correlated with it were phobia and depersonalization/derealization. Conclusion: Depression may contribute to early diagnosis of panic disorder.