Platelet count belongs to an important part of the blood routine examination, the normal reference range is (100-350) × 10^9/L, generally clinically greater than 350 × 10^9/L is called platelet hyperplasia, platelet count increases for the following specific reasons: 1, secondary causes, such as patients if there is a more serious infection or a larger surgery, in the accompanying serious infection and a few days after surgery, the Platelets are generally higher, and the above are some of the secondary causes. If the infection is corrected, or the postoperative situation is stable, platelets can slowly come down without drug intervention; 2. Pathological causes, for example, there is a kind of myeloproliferative neoplasm in hematologic diseases, including chronic granulocytic leukemia, true erythroleukemia, primary thrombocytosis, early or mid-stage myelofibrosis, when platelet counts are generally higher. For myeloproliferative neoplasms, it is important to see a hematologist for pharmacologic intervention, otherwise patients progress more rapidly.