Pi Cang《埤蒼》appeared in the early Wei Dynasty and died out after the Southern Song Dynasty. It follows from Shuo Wen《說文》and followed by Yu Pian《玉篇》, which has been quoted by a large number of dictionaries, thesauruses, Buddhist scriptures and other works. It is an important character book in the Middle Chinese period. Pi Cang《埤蒼》includes a lot of dialectical and folk words in the Middle Chinese period, which is of great value to the research on Chinese history, and is conducive to the tracing of modern Chinese dialectical and folk words to their source. Xuan Ying Yin Yi《玄應音義》cites more than 150 words from Pi Cang《埤蒼》. On the basis of the excellent research results of ancient and modern times, this paper selects seven dialectical and folk words that are still in use in modern Chinese dialects to make a brief analysis.