A lot of statistical data indicate that cardiovascular disease is the first several cause of death of modern people, and heart valve disease is one of them. However, an artificial mechanical heart valve at present still has problems with hemolysis and thrombosis, and red blood cell hemolysis is the subject mechanical external damage, thrombosis is platelet destruction by mechanical force. In this study, by utilizing capillary flow field, installing two different capillary flow fields to measure the hemolytic valve value of blood cells damaged by laminar shear stress. In the past, scholars used other devices with coutte flow to set up flow field. The flow field in this experiment.So this study can be compared with previous studies. On the other hand, the different exposure time in the capillary flow of hemolysis is also discussed in this thesis.