Based on the panel data of China’s main breeding pig provinces (municipalities,autonomous regions) from 2006 to 2010,this paper makes the empirical study on the relationship between scale growth and technology changes of pig breeding in China by using Cobb-Douglas production function.The result shows that the smaller the scale of pig breeding is,the less progress the breeding technology will make,which means that breeding technology does not make significant changes in the retail and small-scale pig breeding,while breeding technology shows significant changes in the medium scale and the large scale breeding.Therefore,this paper proposes some suggestions on how to integrate the retail and small-scale pig breeding farmers as far as the policy is concerned and increase the technical support and policy support for large and medium size pig breeding farmers.