As we have said before, when Emperor Zhenwu was discouraged and wanted to go down the mountain to give up before he finished his practice, he was instructed by ziyuanjun to continue his practice. Now, when you look at the mountain wall on the right side of tongtianbi, you can see two holes. It's said that ziyuanjun was the place where he paid attention to the practice of emperor Zhenwu. The local people called ziyuanjun as the virgin of the mountain, so here It is called "the virgin cave".