Abstract: In order to satisfy the living requirements of lactation sows in north cold area of China, an automatic monitoring and controlling system of piggery interior environment was developed. By synthetically considering the variables, temperature, humidity, NH3 concentration, and their mutual influences, the system realized the intelligent control for piggery interior environment, in which the mechanical ventilation and hot-water heating systems based on the technologies of configuration, fuzzy control as well as decoupling control were used. The test results showed that the environmental monitoring and controlling system was feasible and applicable, the temperature in pig house could be maintained at the needed level while the relative humidity and ammonia concentration could be controlled within the suitable scope as well.