The name of wooden fish comes from the phrase "Fish doesn't meet the eye day and night", so it is necessary to carve wood like a fish and strike it to warn people to think about the Tao day and night.

Muyu is a percussion instrument. Originally a Buddhist musical instrument called Gong Chui (a religious song). Ming Wang folded the "Three Tales Map": "Wooden fish, carved in the shape of fish, empty in it, knocking loudly, ... Today, the praise of Shi's family is used by Brahma."

The wooden fish is in the shape of a ball fish, with a hollow abdomen, an opening in the middle of the head, a coiled tail, a sloping back (percussion part), triangular sides and an oval bottom. Wooden pestle, whose head is olive-shaped, looks like a fish.

Legend:

During the Han Dynasty, the emperor sent Master Ci Guang and two monks to the Western Heaven to learn Buddhist scriptures, and they went through all kinds of hardships. On their way home to learn Buddhist scriptures, when they were boating by boat, suddenly the wind and waves were raging, and an evil fish came at the boat with its mouth wide open, and the scriptures on the bow were swallowed by the big fish. The two monks jumped into the sea and fought with the big fish, killing it and dragging it onto the bow. It was calm and sunny, and the big fish turned into sewage and flowed into the sea, leaving only the fish head on the bow. Master and disciples of Ciguang returned to the Buddhist temple with the big fish head. In order to return the scriptures, they beat the mouth of the big fish head every day and read "Amitabha Buddha ...". Day after day, the big fish head was smashed to pieces. Later, I had to make a wooden one according to the shape of the big fish head and knock it every day. In this way, knocking on wooden fish and chanting has become a habit of Buddhists.