Qi Tian is commonly used in clin. medicine.It contains saponins, Tian, citrulline, and other chem. components, play an important role in anti-tumor, the treatment of diabetes, blood sugar and other aspects.However, medicine Pieces and yams, tetrandra, Angelica is very similar, easily confused, will give beginners difficult.Combined 10 years of experience to guide students to recognize drugs, traditional Chinese medicine describes the confusing identification from the source identification, character identification, microscopic identification, phys. and chem. identification, such as traditional Chinese medicine identification perspective.