Agricultural investment is a important factor to promote the growth of agricultural economy. This thesis take Anhui as an example,obtains from the dynamic analysis of agricultural investment,and establishes the model of econometrics,then analyzes the contribution to the agricultural economy growth separately about the total investment of agricultural and the different main body's investment in agriculture using the C-D production function,and points out that agricultural investment,especially the peasant household's investment,is the important factor which promotes agricultural economy growth. At last,in the light of these analyses,the author put forward some countermeasures suggestions about how to increase the agriculture investment and promote the agricultural economy growth.