Introduction to the ringing stone: In the middle of the backyard of the majestic and carved Laojun Temple in Louguantai, there is an octagonal stone grinding plate. Visitors only need to tap it with their hands to make a sound. The sound range is wide and melodious. , the sound wave cannot disappear for a long time, and the sound is brighter than some metal musical instruments. It is very magical and is called ringing stone.