The research of blood coagulation is paid more and more attention in the recent years. Currently most of the blood coagulation analyzers in the market adopt coagulation method to carry out the measurement. According to the theory of the coagulation method it can be classified two types, one is the measure with photoelectric and nephelometric analysis; the other is the measure with double coil and a magnetic steel ball. coagulation method is physical quantity changes below coagulant acting on blood pl...