Abstract: In order to study the effect of the biofiltration-deodorization device for livestock and poultry on the stench exuded in winter, This paper provided an overview of the winter livestock and poultry deodorization process, illustrating its device structure and the way it worked;the structural design and parameters of its key components werer also provided.The results from practical application of the biofiltration-deodorization device showed that an active filter consisted of 70% grass rot soil, 20% perlite and 10% black wood charcoal;a filtering layer height of 950mm;a filter bed surface loading of 30.0m3·m-2·h-1;and a filter material humidity of (52±3) %could keep the concentration of indoors NH3 under 10mg·m-3 after 6hours continuous running.The deodorization effect was remarkable, and no inside-outside air exchange and indoors temperature fluctuation were found as well.