The purpose of this study is to propose an integrated projection methodology to manage the livestock industry in China sustainably and generate useful data in this context. To achieve this, we constructed a comprehensive set of models, comprising food supply-demand-, nitrogen balance-, and environmental evaluation models respectively. This study focuses on analyzing medium- and long-term projections of the supply-demand balance of nitrogen nutrients in the Huang-Huai-Hai region as well as on the environmental impact due to the influence of livestock products.