Abstract: Aiming at incident Gauss flux radiation conditions caused by the natural light concentration in solar-driven CH4/CO2reforming system, the two-dimensional CFD model is established by finite volume method（FVM） coupled with thermal conduction and convection, non-isothermal flow, radiation transfer, chemical dynamics and Monte Carlo ray tracing, the effects of concentrated solar flux, temperature distribution and component distribution on temperature difference and the solar-to-fuel efficiency are comprehensively studied. On the basis of the optimization of pore scale parameters, the foam inlet is optimized into parabolic concave shape, the results show that the parabolic concave shape can significantly reduce the temperature difference on the front surface, with further improvement on temperature inhomogeneity and foam reactor efficiency. As the concave depth h increases from 5 mm to 12.5 mm, the maximum temperature difference on the front surface decreases from 481.2 K to 95.49 K. Besides, when h=12.5 mm, the solar-to-fuel efficiency reached the optimal value of 50.5%, which is increased by 20.4% compared with the planar foam reactor.