The sinter vertical cooling process is a new technology for sintering waste heat recovery with high efficiency， energy saving and environmental protection，but the process has such problems in the trial operation stage as excessive local resistance of the material bed，uneven cooling of sinter and lower waste heat recovery rate compared with expectation. In order to solve the above problems，an analytical CFD-DEM method is used to calculate the gas-solid multiphase flow field in the sinter vertical cooler with high precision，essentially clarify the coupling motion behavior between the sinter and the cooling gas，focus on the analysis of the accumulation characteristics ( such as porosity distribution，etc. ) and motion mode of the sinter in the vertical cooler，research the flow behavior and distribution law of the cooling air in the process of countercurrent contact with the sinter bed，and analyze the high-precision gas phase flow field data ( such as velocity field) in different regions. The results show that the radial porosity distribution of the material bed is relatively uniform under the condition of multi-channel split distribution. The sinter in the upper part of the media bed steadily decreases at a rate of about 1. 0 mm/s，forming a piston flow. There are particle retention zones at the corners of the device and above the central hood; the sinter velocity at the bottom of the cooling chamber and in the discharge section is significantly increased，forming a funnel flow. The average velocity of the cooling gas gradually decreases and spreads to the wall during the ascent process， and the gas-solid contact conditions at the corner of the device and the area above the central hood are relatively poor， which can be improved by adjusting the inclination angle of the shrinkage section，the center/circumferential air inlet flow ratio，and the inclination and size of the outer edge of the central hood. The results can provide a technical support for the optimization of the sinter vertical cooling process system.