ABSTRACT
Syndrome factors and their combinations based on syndromes are the important links of construction of syndrome differentiation system,in which the theory of prescriptions corresponding to syndromes plays a key role.The basic requirements of good clinical eff icacy are'syndrome factors'seen as the basic connotation of'syndromes'in prescriptions corresponding to syndromes,keeping the compatibility of effect classical prescriptions,emphasizing further detailed formula indication and dynamic evolution,and increasing the conformity of prescription and syndrome.These are also the basis of construction of syndrome differentiation system.Method of evidence-based medicine should be used for reference in clinical research design,and reverse thinking of conjecturing syndrome based on prescription be used for guidance in the constructing process.