After bypass surgery platelets 500 x 10^9/L, if the reactive thrombocytosis is not serious, if the secondary serious infection is more serious. Bypass surgery is a relatively large operation, the operation is more traumatic to the body, after just after the operation, there may be reactive thrombocytosis, but most of them will gradually return to normal. If platelet counts continue to rise or show no sign of decreasing after bypass surgery, it is likely to be caused by post-surgical infections, and the patient should cooperate with the doctor to carry out anti-infection treatment in a timely manner, and the platelet counts will gradually return to normal after the infection is under control. After bypass surgery, platelet count of 500×10^9/L must be treated promptly and observed to avoid aggravation of the situation.