The organizations’construction which is compatible with the before, during or after agricultural production, is an important factor affecting agricultural social service system, and also is an security to improving operation of the agricultural social service system. The paper firstly reviews the development of the organizations' construction of agricultural social service system since the founding of new China. Based on summing up the major problems of agricultural social service organizations, the paper suggests that there are three kinds of thinking about construction of the organizations of rural social service system: Unified-body, Multi-body and combining the Unified-body with Multi-body, and then analyzes every kind of thinking. According to the analysis, the paper thinks that the idea of combining the Unified-body with Multi-body which hidden the thought of contingency construction, should be the best way for the development of the organizations’ construction of agricultural social service organizations because this idea is benefit for giving social forces’ initiative to serve agriculture, adapting complex and diverse needs of agricultural development.