Lhasa means "holy land" or "Buddhist country" in Tibetan. Lhasa was called "Yosa" in ancient times, Tibetan "goat" was called "Yosa" and "earth" was called "Sa". According to legend, the Jokhang Temple was a big pond, which looked like a lying banshee. In the 7th century, when Songzanganbu built Jokhang Temple, goat back soil was used. After the temple was built, the number of monks and people who came to worship Buddha increased. At the same time, Songtsan Gambo expanded his palace in Hongshan (now Potala Palace), so "Yosa" gradually became a "holy land" in people's minds and became the center of religion, politics, economy and culture in Tibet at that time.