To research the effect of pulsation flow on anti-thrombosis, the plasma is treated as water, and the red blood cells are regarded as suspended rigid particles having the same density as water. First, an appropriate embolism is formed in a tapered pipe under a certain hematocrit and differential pressure, and then a pulsating flow is exerted on the inlet of the tapered pipe to study the positive effect on anti-thrombosis of the pulsating flow.