Naxi people are monogamous, and it is forbidden to marry their families. Men and women generally get married around the age of 20, and there are many early marriages. In the old society, marriage paid attention to the right match, parents' orders, matchmakers' words, and the custom of marriage between uncles and nephews prevailed. Marriage generally goes through betrothal, wine invitation, wedding and other procedures. Betrothal, a Japanese clam in Naxi language, means to deliver wine. When a boy is five or six years old, his parents will ask the matchmaker to bring a pot of wine to the right woman's house to be the matchmaker for his son. After the parents agreed, the girl got engaged on an auspicious day when she was about ten years old. After that, the man's family will give gifts to the woman's family, such as "small wine" and "big wine". Every year, Dragon Boat Festival, Mid-Autumn Festival and winter solstice will be given to the woman's home. There is a custom of not seeing the sun at weddings. A big tent was set up in the courtyard, with loose hair on the lower floor and a memorial arch to welcome the bride. The door of the woman's house is closed, singing backchat songs through the door, and answering the singer's opening the door to welcome guests, relatives will refund their money. "The bride said goodbye to her parents and relatives while worshipping her ancestors, crying and expressing her reluctance to leave her family. When the bride enters the door of her husband's house, she must cross the saddle on the right under the threshold to show that she is a member of the man's house. In the past, young Naxi men and women had social freedom before marriage, and falling in love was called "happy life". Generally speaking, they will not be interfered by their parents. They get to know each other and make friends through various festivals and weddings, regularly meet in the fields in the mountains, pluck the strings, pour out their hearts and give each other affection. There is a sharp contradiction between this traditional social freedom and the feudal arranged marriage influenced by Chinese culture, and the class oppression and exploitation in society and the deepening poverty of farmers often prevent young people who love each other from getting married. Loyal to pure love, they met and committed suicide in a beautiful place or a village near Yulong Snow Mountain. According to the tragic situation of love death at that time, Dongba Taoist created the Dongba classic "Lulu Banrao" (the story of herding slaves to migrate), and recommended it as a classic book "Love of the Dead", which was repeatedly recited in Dojo ceremonies. The first love of the Naxi people has changed from the leader who loves ghosts to the goddess of love, and the home of the ghosts, Twelve Swallows Slope, has also evolved into a country that loves snow-capped mountains (a secluded country), and the country that loves ghosts is described as a country with three different realms. After the continuous spread of Dongba religion, the people formed an oral long poem "Wandering Sorrow" (sad tune), which tells the story of the heroine herding sheep on the mountain and being lonely since childhood; The hero, the second son, went hunting in the mountains, and there was no share. The two met in the mountains, told each other their feelings, and fell in love, but it was difficult for them to get married by burning incense and asking for directions, so they went to prepare things for their death. Then both of them climbed the snow-capped mountains and experienced "the first country with spikes on green trees and stones" and the second country without vegetation. After crossing the wooden bridge, the golden flower will not wither and the golden fruit will not drop. "It is an ideal paradise without flies and mosquitoes. The above-mentioned literary works exposed and criticized the unreasonable marriage system, praised people's spirit of fighting for freedom, happiness and pure love, but had a more obvious impact on the martyrdom of Naxi people. Since the founding of New China, due to the continuous improvement of living standards, the gradual popularization of culture and education, and the in-depth implementation of the new marriage law, the freedom of love and the autonomy of marriage have been effectively protected by law, and the custom of Naxi people's double suicide has long existed.