Background: It has been shown that alcohol use disorders are common within a particular family. The risk of alcohol use disorders is known to be three to five times higher for a parent than non-parent alcohol. For this reason, many studies to date have examined the family history of alcohol use problems among adolescents or early adults with drinking problems. However, most studies examined only the existence of alcohol family history, and there were no reports of familial density among alcoholics patients. Objective: The purpose of this study was to investigate the familial density of people with alcohol abuse problems and to investigate the differences in the characteristics of alcohol abuse problems according to their familial density. Method: At four community centers in Busan and Gyeongsangnam-do, familial density was investigated for clients using the service. There were 141 subjects in the study, 113 men and 28 women. Result: Of the people with alcohol use problems, familial density had four groups (family history negative, grandparents or siblings only, parent(s) only, parent(s) and grandparents or siblings, parent(s) and grandparents and siblings,). Familial density was significantly associated with frequency of violence, drinking related, AUDIT-K score. Conclusion: There is a difference in familial density among people with alcohol use problems. However, systematic comparison of variety of measures of family history is lacking. and further study is needed. This study investigated familial density in patients with alcohol use disorder. These results will be the evidence for another perspective on the genetic effects and its risks of alcohol use disorder patients.