Because Yin qi gradually cut off after Qingming Festival, the world did not sacrifice to ancestors. In July, when the yin begins to live, it is said that the ghost door opens in July, and at this time, the wandering ghosts have been starving for a long time, so Buddhism and Taoism will feed the hungry ghosts. When the ghost door opened in July, the ancestors were not necessarily in the ghost house after the ghost door opened. When burning paper, we went to the intersection of the river. Because the ghosts were hungry for a long time, folk burning paper would also burn some for the ghosts.