The normal value of platelets is 125 to 350×10^9/L. If it exceeds 350×10^9/L, it is a high platelet count, i.e. elevated platelets, and is divided into physiological and pathological: 1. Physiological platelet elevation: usually seen in splenectomy, fracture patients, bleeding patients, and patients after surgery, platelets will be stressfully elevated. In addition, clinical chronic inflammatory infection patients platelet count will also be elevated, these cases of platelet elevation are physiological, do not need treatment. 2, pathological platelet elevation: clinically common diseases are primary thrombocytosis, true erythrocytosis, these two diseases belong to myeloproliferative diseases. There is also a chronic granulocytic leukemia, platelets will also be elevated. There are also commonly seen tumors and bone marrow metastases, where platelets are also elevated. These conditions are pathological and we have to pay attention to them. Like physiological, there is absolutely no need for treatment and no need to panic.