The process of physiological hemostasis: The first step is vasoconstriction. That is, the patient’s local injury, stimulation appears reflex vasoconstriction, local vascular myogenic contraction, platelets attached to the injury will release the vascularized substances, so that the local blood flow is reduced. The second step, the formation of platelets, adhesion. The platelet local coagulation process will generate thrombin, forming platelet-causing thrombus to block the wound, this step can achieve initial hemostasis, also known as the first stage of hemostasis. The third step is the coagulation of blood. Soluble fibrin in the patient’s plasma will be transformed into insoluble fibrin and interwoven into a network to reinforce the formation of thrombinogenase to stop the thrombus, also known as phase II hemostasis. With these three steps, physiological hemostasis of the wound can be achieved.