A family with Angle's Class ii malocclusion was identified in West China Stomatological Hospital of Sichuan University. The proband was a 22-year-old woman with Angle's Class II Division 2 malocclusion with congenitally missing teeth. A total of 15 members of the 3 generations in the family were investigated. There were 7 members (3 males, 4 females) with Angle's Class II malocclusion in the family. The results provide the primary basis for further study to localize the virulence gene.