Next-generation sequencing (NGS) technologies have improved as well as the costs have gradually decreased in the detections of genetic diseases. This article describes the principle, platform, and data analysis of NGS and the application of NGS technologies to the molecular diagnosis of hereditary hearing loss (HL). The use of NGS technologies makes the discovery of HL genes more feasible than ever. And the data obtained by NGS used in genetic counseling for clinical practice may assist in defining genetic profiles of HL individuals and expedite the pace of personalized medical care.