This paper describes a numerical prediction method for thrombus formation in blood flows using Lattice Boltzmann Method (LBM) and Finite Difference Method (FDM). In this study, the now around a cylinder between two plates to compare the prediction experiment by Liu et al. Using these database, quantity of thrombus is predicted by integrating (l) transport equation for concentration of blood coagulation factor and (2) shear velocity, and (3) wall distance. It is concluded that the trend to have thrombus formations around the cylinder is similar to the experiments, but the prediction model is not complete.