Injuries caused by consanguineous unions can generally be inherited for up to 3 generations, and their genetic damage is both direct and intergenerational, and is generally common in certain recessive genetic disorders. 1. Direct inheritance: consanguineous marriage mainly refers to couples within three generations of a common ancestor, commonly known as direct blood relatives within three generations, if both parties carry a gene recessive genetic diseases, the probability of their next generation of genetic diseases accounted for 50%. 2. Intergenerational inheritance: Due to the different genes and chromosomes, there are similarities in genes between relatives, and some genetic diseases can be intergenerationally inherited, with no problems in the first generation but diseases appearing in the grandchildren’s children and grandchildren. The closer the blood relationship in consanguineous marriages, the greater the risk of genetic diseases, and the more generations of offspring, the less affected they are, and consanguineous marriages are prohibited by the State.