Abstract: Objective:To explore the factors affecting the pathological diagnosis of lung mass.Methods:A retrospective analysis of 148 cases of mass distribution in lung was performed.The cases were divided into tumor group and non-tumor group according to the results of pathological diagnosis.Results:The incidence of lung cancer was higher in patients above the age of 60 than that under 60 (P<0.01);but the positive rate had not significant difference in gender or distribution of lung mass.Conclusions:The highest incidence of lung cancer is observed in patients with lung mass above the age of 60.