To reach the objective of human resource development, there is ”educational method” in educational agriculture extension. In the other side, to reach the objective of informational and technical extension, there is ”contractual method” in contractual agriculture extension. To farmers, these two kind of agricultural extension method are roads going to improve their economic situation, but just having different kind of method and intention. So, we intend to discuss with three dimensions in this research. And they are ”agent”, ”extension affairs” and ”object” (farmer). However, we'll compare the structural meaning behind Farmer Association of educational agriculture extension, Taiwan Sugar Ltd. Com. and C. P. Group of contractual agriculture extension.