Yin marriage (also known as ghost marriage, bone matching and ghost marriage) is a folk custom, which refers to the marriage with the participation of the deceased, which is divided into two types: the dead and the dead, the dead and the living. In the old days, people thought that the existence of solitary graves in ancestral graves would affect the prosperity of future generations, so it was necessary to hold a yin marriage for the deceased to avoid the emergence of solitary graves in men's and women's fields. Ghost marriage mostly appears in aristocratic or rich families, and poor families rarely see such activities. In the past, people were generally superstitious about the so-called "geomantic omen" in cemeteries, believing that the appearance of isolated graves would affect the prosperity of future generations of family houses. At that time, some "Mr. Feng Shui" (called "Feng Shui" in ancient times) strongly encouraged this kind of yin marriage in order to earn more money. Yin marriage mostly occurs in aristocratic or rich families, and poor families rarely engage in such activities.