Chlorogenic Acid (CHA,3-O-caffeoylquinic acid) is the hydroxybenzene-acid by retracting of caffeic acid and quinic acid. Wich is one of the effective components (eg. Honeysuckle、 Eucmmai ulmoides Oliv. Coffee bean. Ramee etc) .CHA have strong action: antibacterial, anticancer, antiaids and antioxidant. This article presents a systematical research on the quality control methodologies of the bulk material land the drug. The purpose of the research is to ensure the effectiveness and accuracy of the quality co...