Abstract: This paper introduces the main work in the spreading of science knowledge in the fiels of agricultural engineering by CSAE in the past ten years. The extension and service work of CSAE consists of technical training, continuous education, editing and publishing popular science readings, making popular science videotapes and spreading practical technics in the rural area.The paper also advances some suggestions of the extension and service work of agricultural engineering of CSAE in future. They are as follows:(1)popularize those excellent scientific achievements of agricultural engineering directly to peasants.(2)The principal extension projects must be the practical, small-scale, short-term and high benefit ones,(3)CSAE should attach great importance to the continuous education.(4)CSAE should help and support those agricultural technical research association organized by farmers themselves.