The Book of Songs is the main source of the idioms that we use today. Nevertheless, since The Book of Songs was written very long time ago, the ancient idioms appeared in the work are different from the idioms of today. Besides, people of all these past years successively have different interpretations and intervention towards the contents of this work, so the original meanings of the writing appeared in The Book of Songs have been misinterpreted and confused to different extents. Accordingly, the meanings of the idioms originated from The Book of Songs have been distorted, and even become the opposite meanings. This paper intends to make full use of the research results of the predecessors, and attempts to make an in-depth investigation of the scriptures. It is hoped that the original form of the scriptures of The Book of Songs can be restored. After that, the paper investigates the origin of idioms, and clarifies the meanings of the idioms which have been misinterpreted for a long time.