Lemmon (1786 ~ 1854), a famous French music publisher, is also an excellent piano teacher and composer. As a successful publisher, he published many works of famous composers of his time, such as Chopin's Piano Teacher. He founded a systematic and scientific piano teacher system and applied it to teaching practice. Lemmon piano etude (Op.37) is an advanced piano practice textbook specially written by Lemmon for children, which consists of 50 etudes of different lengths. This textbook has been widely circulated since its publication and has also been widely used in piano teaching in China.