《考工记》是我国工艺史上早期最重要的文献之一，其时代一般断为春秋末期至战国初，确切时代难以确定。若据其中“道”及“审曲面势，以饬五材”中“势”的阴阳刚柔及结构来断代，可能更有所帮助。因为道及刚柔、阴阳的内涵或其系统，有其本身的演化规律，每种文献中出现的类 “Kao Gong Ji” is one of the most important documents in the history of the craft in our country. Its era is generally broken from the late Spring and Autumn Period to the beginning of the Warring States Period. The exact era is difficult to be determined. It may be more helpful if the yin-yang rigid and soft structure of the “potential” in the “Tao” and “the situation in the trial and the correction of the situation and the five materials” be used. Because the Tao and rigid, the content of yin and yang or its system, has its own evolution, the types of each category