对第二代空气质量模式—混合烟气扩散模式HPDM进行了分析,通过与PPSP、AMS、GB等模式的对比和工程验算,指出了HPDM在计算混合层高度和处理烟气穿透方面的缺陷,并提出了相应的改进方案。计算结果表明:改进以后的模式性能更加完善,其预测结果总体上与改进前相当,但在夜间不出现浓度值的大幅度跃变,在部分局部穿透情况下不出现极端高浓度。 The second generation of air quality model - mixed gas diffusion model HPDM was analyzed. Through comparing with PPSP, AMS, GB and engineering verification, the defects of HPDM in calculating mixed layer height and dealing with flue gas penetration were pointed out , And put forward the corresponding improvement plan. The calculation results show that the performance of the improved model is more perfect, and the prediction results are generally equivalent to those before the improvement. However, no significant concentration jump occurs at night, and no extreme high concentration occurs in the partial penetration.