The invention discloses a method for confirming the warfarin quantity used for Chinese individual; the genome DNA of the patient is extracted for genotype detection and then the drug quantity of every patient is induced based on the age, weight and the genotype of VKORC1(-1639G more than A) and CYP2C9 to help the clinical doctor to use warfarin more rationally; in this way, INR proper level can be obtained in advance and the probability of bleeding and other adverse events; the safety for drug use and the treatment effect are promoted.