Dui Yao is a form of paired drugs in prescriptions. Professor Xiao Chengcong is skilled in using the paired drugs, to enhance their effectiveness, or to reconcile cold and heat, or to combinestatic and dynamic, or to tonify and attack at the same time, or to reduce the toxicity. The prescription management method has been appropriate and frequently to see the good effect. This paper was to study Professor Xiaos parts of clinical application of the paired drugs, in order to explore her characteristics of drug use, and to further develop her academic experiences.