[Analysis on various deduction patterns of Yunqi theory in the Seven Major Discourses in suwen (plain questions)].

It is pointed out that in the Seven Major Discourses, there are different patterns of deducing Yunqi theory. The design and method of deduction are then dealt with. In the light of the fact that there was physician in the staff of astronomical organization in the Eastern Han Dynasty as well as the cultural background as a whole, it is concluded that the KYunqi theory was proposed at the turn of middle and later period of Eastern Han Dynasty.