Children’s blood diseases commonly include acute lymphoblastic leukemia, lymphoma, aplastic anemia, immune thrombocytopenic purpura, hemophilia, etc. Therefore, the early symptoms of children’s blood diseases are characterized by the following symptoms: i. Anemia symptoms, for example, in acute lymphoblastic leukemia and aplastic anemia, the children will appear pale, headache, dizziness, fatigue, and laziness. Second, the symptoms of infection, such as acute leukemia patients, children will appear in the early stage of fever symptoms, can be low or high fever, often oral infection, lung infection, perianal infection and so on. Third, bleeding symptoms, such as autoimmune thrombocytopenic purpura, the patient will appear obvious skin and mucous membrane bleeding spots, petechiae, especially hemophilia patients, since childhood, skin and mucous membrane petechiae, but also joints, muscle deep hematoma.