Abstract: Three air pollution events happened from November 28, 2016 to January 11, 2017 in Henan Province. They occurred during November 28- December 5, 2016, December 15-21, 2016, and December 28, 2016-January 11, 2017 respectively. Each pollution event lasted several days, especially 15 days for the last one, with magnitude of moderate or above. Four days after the second air pollution process, serious pollution was spread from the north to the south covering the whole province. For enabling better forecast of consecutive air pollution event in the future, this study analyzed the evolution of meteorological elements and the situation of the upper ground surface of the three pollution processes in detail. Weather features with predictive significance were summarized. Serious pollution weather may be triggered in case the temperature difference between day and night drops to 4~6℃, dew point temperature drops to 0-5℃, the wind is about 2 m·s^-1, and pressure amplitude is less than 5 hPa. During the pollution period, there were more short-wave trough activities in Henan. The ground was generally equalized or saddle-shaped probably because of the west-to-southwest airstream in the long-term. Air pollution is prone to occur when the pressure gradient was small, and the wind force was weak. As indicated by the L-band sounding data, heavy pollution may occur when there is temperature inversion below 200 m, the wind speed below 100m is less than 3 m·s^-1, and the relative humidity of the surface layer is about 50%. The pollution will be weakened but not completely removed if there is light rainfall. When the sky turns into a stronger northwest airstream or the ground has strong cold air south (i.e., the pressure gradient force increases and the wind force obviously increases), the polluted weather will be completely disappeared.