Abstract: The development of the software CORCA-3 D and CORCA-K developed on self-reliance involves the correctness verification of core diffusion numerical calculation. In order to improve the efficiency of R&D, based on the core module named TRIVAC in DRAGON, the automatic contrast verification scheme of DRAGON and the core neutronics software developed on self-reliance is established for benchmark scenes of the square fuel assembly, which assists the development of the software. This scheme could be customized according to the content of calculation, and multiple benchmark diffusion problems are checked. The results of numerical experiments ensure the correctness of the core modules and serve as a basic test procedure to reduce the burden of software developers.