Weigi(衛氣) is defensive energy which moves outside the conduits, permeating the surface of the body and warding off exogenous pathogens ; superficial resistance of the body. Yinggi(營氣) is constructive energy which moves though the conduits and nourishes all the organs This volume commets on creation and gathering of Yinggi(營氣)-Weigi(衛氣). Therefore subjicts can be chosen Yong Wi Sang Whei(營衛生會). This volume contents three chapters ChapterⅠdeals that yingi(營氣) is created from zhuogi(終期) ; dense part of food essence or waste gas, e.g., the air expirde or flactus discharged; and wei is created from qinggi(淸氣); ⑴ fresh air usually referred to the air inspired in the lung ⑵ food energy or nutrient esp. the clarified thin part of food essence ⑶ clear up the evil heat from the Qi system: a method in treating febrile diseases. Chapter Ⅱ deals with the difference between a youth and adult. Chapter Ⅲ deals with the relation between yinwei(영위) and Triple Burners.