Abstract: To understand and evaluate the main function and potential problem of environmental control strategy in piggery, bacteria survey and its eat and flow law were carried out to ensure the safe production during animal epidemic prevention. The investigation showed that the certain desinfection measures could prevent pathogen bacteria incursion effectively, but the amount of bacteria in the air rose again quickly and that of middle in pigpen was higher obviously than those of both sides. The disinfection effect of drinking troughs and cribs was dubious, which would be the main way of disease spread among swines. Furthermore, the targeted measures should be put forword during the period of animal epidemic prevention.

Key words: piggery; animal epidemic prevention; environmental control strategy; bacteria survey