Abstract: The performance test on the newly created fast neutron radiography system was described in this paper. And the experimental study of 14 MeV fast neutron radiography system based on d-T linear neutron source with high L/D ratio collimator was performed on Cockcroft-Walton generator in China Institute of Atomic Energy. The position resolutions of the fast neutron radiography system to polythylene, aluminum, iron and lead were investigated with the thick edge method and the indicator method, and the results of the two methods are in coindence. The results indicate that the spatial resolution of the system is better than 1 mm to a single material, and this is in accordance with the theoretical calculation and analysis.