The coagulation process is the transformation of human blood from a liquid state to a solid state. Coagulation is accomplished through the exogenous coagulation pathway and the endogenous coagulation pathway. The three stages of the coagulation process are from the beginning of coagulation to the activation of factor X. During this process, the exogenous coagulation pathway is clearly different from the endogenous coagulation pathway, and the subsequent stages are identical and consist of two parts: first, the activation of factor X to factor II, and then the activation of factor II to fibrinogen. In this case, in the initial stage the exogenous coagulation pathway is that after the exposure of collagen fibers, the tissue factor, which is factor III, is activated first, and then factor VII is activated, and then factor X can be activated. The endogenous coagulation pathway first activates factor Ⅻ, then factor Ⅺ, then factor Ⅸ, factor VIII, and finally factor X. Second, after the activation of factor X, it can activate thrombin, which is factor II, and then activate fibrinogen, which is factor I, thus completing the coagulation process.