Carving a boat for a sword is a fable of Lu's Spring and Autumn Period-Cha Jin. The content is: a man in the state of Chu crossed the river, and his sword fell from the boat into the water. He immediately made a mark on the side of the boat and said, This is where my sword fell. The ship stopped, and the Chu people went into the water from the marked place to look for the sword. This fable tells us that things in the world are constantly developing and changing. We can't do things subjectively, and people can't stick to dogma. When the situation changes, the method to solve the problem will also change, otherwise it will fail.