Yunnan Province is located in China's southwest region, which is the potential growth area of pig breeding. With the vigorous development of the whole pig breeding industry, the large-scale process of pig breeding in various regions is irreversible. Therefore, under the current situation of pig breeding, it is of great guiding significance to study which scale breeding mode is more sufficient to bring expected economic benefits for the pig production industry in Yunnan Province. Based on the study of the cost and benefit of retail and small, medium and large scale pig breeding in Yunnan Province, this paper selects relevant index data from 2010 to 2021, and uses grey situation decision method to further measure the comprehensive benefit of small, medium and large scale pig breeding.The results show that the medium scale pig breeding model is more suitable for the development of Yunnan pig production industry. Due to the limitations in the selection of indicators, based on the suggestion of moderate scale management, this paper puts forward relevant suggestions from the aspects of collective economy, pig breeding and propagation, pig disease prevention and control, green ecological breeding, cooperation mode, industrial management, etc., so as to help the sustainable, healthy and orderly development of Yunnan pig industry.