"Three-thirds system" originally refers to the personnel composition or staffing form of an organization. China adopted the "three-thirds system" in the military infantry system in many periods. For example, one regiment governs three battalions, one battalion governs three companies, one platoon governs three classes, one class governs three regiments, and one regiment governs three people. This "three-thirds system" military establishment has played a very good role in improving the execution of command orders, effectively deploying firepower and coordinating tactical maneuvers. It can also be said that it is the prototype or epitome of "modular configuration" in modern tactics. "Medication is like the use of soldiers", said Xu Dachun, a physician in the Qing Dynasty. "Soldiers are also used to eliminate violence ... drugs are also designed to attack diseases ... and their methods are the same". In many classic prescriptions we commonly use, except for the "small prescription" of "Chen Junyi II, which is small" in Su Wen Zhi Zhen Da Lun, many "Chen Junyi III Zuo Wu, which is middle" and "Chen Junyi III Zuo Jiu, which is big" are generous compounds.