This paper constructs the market- oriented index model based on the special nature of agricultural infrastructure projects,and uses the Delphi method to calculate the index value. Finally,investment subjects of eight categories in agricultural infrastructure projects based on the size of the index value are located. The result shows that projects with higher degree of marketization include agricultural mechanization construction projects,agricultural products storage facilities and agricultural products wholesale market . Projects with a common degree of marketization include small and medium-sized irrigation and water conservancy,rural information service and rural road construction projects.Projects with a lower degree of marketization include rural power construction projects and large rivers construction projects. Therefore,this paper points out that enterprises,farmers and other private sectors are the investment subjects of the higher degree of marketization projects. The investment subjects of the common degree of market projects are government,other private sectors can also participate in such investment.; The investment subjects of the lower marketization are mainly governments