《呂氏春秋》其思想內容乃雜揉先秦諸子之說，計對不同問題而提出其所認為適當的解決之道，其以為戰國之世所以會導致世局動蕩不安，人民陷於苦難之中，其主因乃在於無天子在位，使國之間的相互兼併，而導致兵戈不息，進而令天下黎民飽受因兵災所帶來的種種苦難，故其主張應該另立新天子而使天下重歸一統，才能夠真正的平息狼煙，解民倒懸。而如何使天下歸為一統？面對此一問題，《呂氏春秋》一書就提出所謂的義兵之道，一方面以破除當時偃兵、救守之應，一方面作為武力統一的理論根據，而其所謂的義兵思想，意義究竟為何所以征討的對象為何？又是誰能行義兵之道？行義兵之道，應作好那些準備及注意那些事項？透過本文將針對這些問題一一作一說明。

The content of the ideas in the book Lu’s Spring and Autumn Annals is mingled by the works of the philosophers of the pre-Qin period. These thoughts can precipitate appropriate settlements of an array of different issues faced by the unfortunate and destitute people in the Warring States Period, which is an epoch in Chinese history with a restless political environment and a great number of wars between principalities resulting in lost of annexations and causing a pitiful plight of the civilians in that period of time due to the lack of an emperor. Consequently this book maintains an opinion that a new emperor should ascend the throne in order to unite the whole kingdom, quell war alarms raised everywhere and rescue the people form misery. However, here comes the question: how to unify the whole country? To this question, the Lu’s Spring and Autumn Annals sets forth a new doctrine of the so-called “wars for moral principles”, which, on the one hand, can explode the theory of stopping the fanfare and saving each country so that is may survive and, on the other hand, serve as the rationale for the unification of the whole country through the use of force. Next, how to define the so-called ideas of wars for moral principles? What should be prepared and noticed if someone wants to levy these wars? I am going to clear up the above questions point by point through the following dissertation.