Abstract: Flavonoids are important active ingredients in traditional Chinese medicine. However, their applications for the pharmaceutical use are greatly limited by low oral bioavailability due to poor aqueous solubility. The study of pharmaceutical crystallography is a potential approach to solve many problems of poor solubility. Research progress of flavonoid compounds in pharmaceutical crystallography field was reviewed from following aspects:polymorphism, cocrystal, amorphous/co-amorphous and nanocrystals. The information provided here is expected to serve as a reference for the applications of pharmaceutical crystallography in the poorly soluble components of traditional Chinese medicine.