Abstract: Ecological pig raising is a good model for pig production using the ecological principle,and plays an important role in ecological environment protect and the sustainable development of pig industry. In the present study,Early diagnosis of Porcine reproductive and respiratory syndrome （PRRS） was carried out in ecological pig farms using ELISA,and then the biosecurity system of pig farms were reconstructed to comprehensive prevented and controlled epidemic diseases. The results showed that through early diagnose of PRRS and reconstruction of biosecurity system,the PRRS in ecological pig farms has been effectively controlled.