To learn ancient Chinese, we should not only pay attention to reading selected works, but also learn the theoretical knowledge of ancient Chinese, master the knowledge of words, phonology, vocabulary and grammar summarized by predecessors, and use it to control and analyze the language materials of ancient Chinese. This can really get twice the result with half the effort. In today's era of constantly updating knowledge, most people can't completely immerse themselves in ancient books like the ancients, and slowly explore and understand with their own perceptual experience. It takes too much effort and time to do so. Besides, we still have many advantages today, because our predecessors spent a lot of energy sorting out the regular knowledge about ancient Chinese for us. The knowledge of ancient Chinese covers a wide range, and the focus should be on learning vocabulary knowledge and grammar knowledge.