ABSTRACT
The formula-factors concept was put forwarded in this article on account of the syndrome-factors theory. While the prescription compatibility principles "correspondence between syndrome and formula factors" was deduced form the differentiation of syndrome and treatment principles "correspondence between syndrome and formula". Founding on these concepts,the relation between "correspondence between syndrome and formula factors" and "principal,adjuvant,auxiliary and conductant ingredirnts" was approached on the prescription compatibility. And the result was that both compatibility principles above were interweaving associated for their supplementing each other. This conclusion was significative to the prescription compatibility theory as well as TCM clinical practice.