The invention provides a method for judging antenatal parental right relation with SNP. The SNP is used as a genetic marker, and judgment of the antenatal parental right relation is conducted through cooperation of the SNP and the high throughput sequencing technology. Only 10 ml of maternal peripheral blood is needed, free DNA extracted from the maternal peripheral blood plasma contains the free DNA of a fetus already, so that only one sample of a mother and the fetus is needed. Due to the fact that only the venous blood of a pregnant woman needs to be extracted, operation is simple and convenient, the pregnant woman and the fetus cannot be damaged.
