A platelet count over 400 x 10^9/L is called thrombocytosis, and if elevated platelets are found, it is best to review the test once every 3-4 weeks. Generally speaking, the normal range of platelets is between (100-300)×10^9/L, platelet count more than 400×10^9/L need to be timely rechecked, if the platelets more than 500×10^9/L need to carry out bone marrow aspiration check, clear the cause of thrombocytosis, for the cause of treatment. Usually must pay attention to rest, keep happy mood, more exercise. Diet should be light, eat more green vegetables, eat less high-fat food, such as fat meat, fried food, etc., and also need to monitor blood pressure.