The Commercial Press's "Ancient Chinese Commonly Used Words" was a very important Chinese dictionary. It collected a large number of ancient Chinese characters and vocabulary and provided detailed explanations and usage instructions. This book is one of the essential reference books for Chinese language learning and enthusiasts, and also an important reference material for Chinese character researchers. There are 4500 Chinese characters in the Common Words of Ancient Chinese. Some of them are no longer used in modern Chinese, but they play a very important role in ancient Chinese. In addition, the dictionary also provided notes and explanations for some difficult words to help readers better understand the meaning and usage of these words. In addition to the collection of Chinese characters, the Commercial Press's "Ancient Chinese Commonly Used Words dictionary" also had detailed annotations in terms of strokes, Pinyin, and the head of the word for the convenience of readers to learn and use. In short, the Ancient Chinese Commonly Used Words dictionary is a very practical and important Chinese dictionary, which is of great help to Chinese language scholars and Chinese character researchers.