The characteristics of syndromes are manifested as periodic changes of lung,spleen and kidney found in the development process of exopathic diseases through analysing on syndrome differentiation and treatment laws of exterior syndrome in dual disease of exterior and interior in Shanghanzabinglun.

Cold pathogens invade the exterior and bind up the defense qi,leading to exterior syndrome,which is characterized by aversion to cold.

It developedthe syndrome differentiation dependent treatment system,this system took on meridian and viscera syndrome differentiation as core and directed by concept of wholism and combination of differentiation of syndrome and disease,used comprehensive analysis of the pulse condition andsyndrome as main methods,principles of treatment i.

The gray relational degree analysis method for choosing hydrologic reference basin;

Based on the qualitative and quantitative analysis,a gray system optimum theoretical model for choosing hydrological reference basin is presented in this paper.