Among all patients with GJB2 hereditary deafness, 145 cases were 235delC homozygous mutations, 109 cases were 235delC/299_300delAT compound mutations, 235delC/176del16 compound mutations, 35delG/235delC compound mutations, 235delC/512insAACG compound mutations, and 299_300delAT pure, and 235delC mutations were each in 102 cases. The gene discussed is GJB2; the disease is deafness.