Thank guests behind closed doors and practice in seclusion. Zen master, in particular, no longer works for others, but devotes himself to meditation and practice in his room. The Buddhist community in China quite welcomes behind closed doors. In addition to Zen, students from other sects often close their doors, such as Pure Land Sect and Pure Land Pass. Hua Yanzong, Guan Hua and others. At that time, the place of residence was called "Fangguan". Those who are closed to the outside world either study Tibetan studies or specialize in one subject, depending on the expected goals. The time limit is not necessarily, ranging from several months to several years. During closed doors, the principle is not to leave the house. So outside the house, someone must take care of food, medical care and other things, which is called housekeeping.