Hemophilia (hemophilia) is a group of bleeding disorders that are inherited in a sex-linked recessive manner. It is clinically classified into two types, hemophilia A (coagulation factor VIII deficiency) and hemophilia B (coagulation factor IX deficiency), which are caused by mutations in the coagulation factor VIII (F VIII) and coagulation factor IX (F IX) genes, respectively. In the male population, the incidence of hemophilia A is about 1/5000 and the incidence of hemophilia B is about 1/25000; hemophilia A accounts for about 80%-85% of all hemophiliac males and hemophilia B accounts for about 15%-20%. Female hemophiliacs are extremely rare. Clinically, hemophilia is characterized by unstoppable bleeding from joints, muscles, internal organs and deep tissues after spontaneous or minor trauma. Patients with hemophilia suffer from lifelong physical and mental health problems, schooling, employment, family, marriage, financial resources and social activities. People with hemophilia are socially disadvantaged and deserve the care and support of their families, communities, schools and organizations. As a health care worker, we should do our best to solve the problems of patients and their families. We should master the basic knowledge of hemophilia and the standardized diagnosis and treatment methods, and serve patients wholeheartedly. In the future, I will publish information on the diagnosis and treatment of hemophilia from time to time, so that more people will know and care about hemophilia patients.