Abstract: Abstract: The temperature, humidity, and cleanliness of the air in the delivery pigsty have posed an important impact on the safe delivery and the survival rate of piglets. However, the energy consumption is too high in the conventional air-conditioning system that mainly heats and cools the air, due to the harsh requirements of fresh air, and heat loss of the exhaust air system in the pigsty. Once the air turbulence was over-loaded in the air-conditioning, there is an increasing risk of cross-infection of pigs. In this study, an environmental protection system was proposed using radiation and personalized ventilation, particularly extending the human thermal comfort to farmed animals. A simulation analysis was performed on the air temperature and air flow under an engineering case in the delivery pigsty. The energy consumption index was determined in the environmental protection system using computational fluid dynamics (CFD). A DeST energy consumption simulation software was used to calculate the energy consumption of the system, the cooling and heating load. The air distribution was analyzed in the environmental protection system using the CFD software. Moreover, the economic evaluation was made on the modified radiation and personalized ventilation. The results showed that there were an uncomfortable temperature and extremely high humidity in the traditional wet curtain fan system in the delivery pigsty. There was also a large energy consumption of the conventional air-conditioning system for heating and cooling air in the delivery room, which was the well-protected environment. In addition, the sows and piglets cannot be controlled in different areas, especially in the summer, where the sows were supplied with cooling, and the piglets were supplied with district heating, so that both cold and heat loads run at the same time, resulting in the waste of energy. By contrast, the air temperature in the fence was ensured at 16-27 ℃ under the radiation and personalized ventilation technology, and the system energy consumption was reduced 42.04 % and 58.54 % than that in the wet curtain fan and the conventional air-conditioning system. The investment payback period was 5a for the transformation from the wet curtain fan system to the new environmental protection system using radiation and personalized ventilation. Furthermore, the areas of sow and piglet in the fence shared an independent temperature control system, according to the air distribution in the delivery pigsty. As such, the different requirements of the sow and piglet were fully met to realize the personalized control of the air conditioning system. Each fence was set as an independent air supply port to avoid the collision of transverse and longitudinal air flow, where there was almost no cross airflow in each fence. The airflow crossover between different fences was reduced to avoid the spread of pollutants, further to alleviate the risk of cross-infection of the epidemic in the pigsty. The finding can also provide technical support to the decision-making on the thermal environmental regulation system in the delivery pigsty.