This paper trys to establish the autonomy and subjectivity in each system of extension institutions under the basis of "the establishing attributes" and "the executive means" of extension organizations. Furthermore, this paper trys to distinguish the difference of duties between the extension system of Farmer's/Fisherman's Association and the system of Agriculture Improvement station by examing "extension proceeding", and "extension style". At last, this paper discusses the different main tasks of every extension system from the viewpoint of autonomy and subjectivity, in order to build up an integrated agricultural extension constitution which can fully reflect farmer's/fisherman's opinions. The is will be conducive to confirming the identity of Farmer's/Fisherman's Association system in the plural agricultural extension systems.