In order to define guidelines on appropriate regulation of the agricultural products market, this paper will create market demarcation models based on the demand theory in microeconomics, and will also analyze the cross elasticity between particular agricultural products in order to clarify the boundaries of appropriate market delineation. Then it will analyze the manufacturing and marketing structure of 40 agricultural products, as well as the changing trends in their market concentration levels, based on the relationship patterns between market structure and manufacturing behavior. This analysis will serve as a basis for the study of appropriate regulation on agricultural products market. Since the Fair Trade Law is a highly complex administrative law that combines jurisprudential and economic theories, this paper will also take a juristical approach to the competitive and synergetic relationships between the Fair Trade Law and the myriad activities on the agricultural products market. Quoting the agricultural competition laws from various countries such as the U. S. A., Japan, Korea and European nations, as well as specific case analysis, this paper will define the various types of behavior that impede fair competition on Taiwan's agricultural products market. It is hoped that by defining the guidelines for appropriate regulation on the agricultural products market through the Fair Trade law, behavior that impedes fair competition or creates unfair competition will be eliminated, and thus implementation of the Fair Trade Law will promote better efficiency and will increasingly benefit the overaII economy.