Abstract: To solve radiative heat transfer problems, the determination of gas radiative properties can be accurately obtained by the exponential wide band model(EWBM), but it is unfit to online engineering application owing to its complex computational process and slow computation speed. Based on the analysis of EWBM results, the computational temperature range was determined by the temperature of furnace gas and the furnace internal surface. The parameters for each band were regressed to the functional expressions changed with temperature and pressure, which significantly simplifies the solving process and improves the computational efficiency on the premise of accuracy guarantee.