In order to study the influence of the change of porosity of the tight end and middle section of cigarette stubs on the pressure drop of cigarette stubs and the distribution of gas rate inside cigarette stubs, the simulation analysis of cigarette stubs under the conditions of different pumping flow rates (15 ml/s, 17.5 ml/s, and 20 ml/s) and pumping pressures (–60pa, –90pa, and –130pa) has been carried out by using Computational Fluid Dynamics (CFD) method. The results showed that the velocity and pressure values of the airflow inside the cigarette were significantly different when the porosity of the tight end and the middle section` were distinguished under the same average porosity. For the velocity of the airflow inside the cigarette, the calculated value of the airflow rate at the suction end is generally small, while the calculated value at the ignition end is generally large, and this deviation is most significant at the middle position of the cigarette, with the maximum deviation reaching 2.34%. For the pressure field inside the cigarette, the calculated values were generally small, and the maximum deviation was as high as 6.55%. Therefore, the complex structural and hydrodynamic behaviors inside the cigarette are not accurately reflected by using the same porosity uniform porous media model.