Abstract: This paper establishes a numerical simulation model of the solar ventilation preheating wall in purpose of obtaining a simplify calculations method for the thermal efficiency that can be easily applied. Five structural parameters,such as height ratio H*,characteristic thickness δ*,porosity σ,corrugation concavity Lw,and corrugation degree w*,are introduced. The coupling relationship between them and the near-wall Reynolds number Re on the solar wall Nusselt number Nu,heat transfer coefficient Hεand differential pressure value pdropis investigated by numerical simulation. The system performance indexes present a power function law with respect to Re,and a quadratic exponential function law in relation to the logarithm of σ and other parameters. The calculated empirical coefficients are obtained using the LM optimization algorithm. The results indicate that the simplified calculation results of Nu number and differential pressure have a maximum deviation of 6.85% from the simulation results. The simplified calculation results of heat collection efficiency have an average error of 4.89% and a maximum error of 6.69% with the experimental test results. The accuracy of the corrected data is improved by nearly 10% on average compared with the corrected values achieved by the traditional calculation method. The results are in good agreement and provide a reference for engineering design.