In order to quantitatively assess ecological benefits of China grain for green project, an ecological benefits monitoring network was constructed by integrated data of China forestry zone, grain for green zone, forest ecology station and DEM data interconnecting with spatial analysis of GIS firstly. The network included 130 grain for green ecological monitoring zones and 157 ecological stations, in which 79 were established and the remaining 78 stations were in planning. Secondly, accuracy assessment of this network was done based on county-level data of grain for green project, and the total accuracy was 96.2%. Furthermore, the main focuses of different ecological benefits monitoring of grain for green project were pointed out. The network can implement forest ecological inventory in the area of China grain for green project, and provide data and decision support for the ecological benefit assess of the project.