YunQi theory proposed unique understanding to the nature of seasonal epidemics and accumulated clinical experience a lot. Its Compatibility of Prescription principle demanded the treatment to epidemics should be Flexibly decided according to the season

disease and symptoms etc. The series prescriptions could be chosen according to 5 Yun and 6 Qi characteristics in different years

or according to No-seasonal Qi

or seasonal diseases. Patent Chinese medicines for epidemics also follow the above principle

such as the King Drug was determined according to YunQi in different years. It is important to have a in-depth study of compatibility of prescription principle for epidemics guided by YunQi theory for the improvement of TCM in prevention and control seasonal epidemics.