In order to better optimize site selection and plan selection of natural gas longdistance pipelines. In this paper, through studying land policy factors related to cultivated land have been reviewed and studied, such as cultivated land, permanent basic farmland and ecological protection red lines along north pipeline project in Shandong province, combining with site selection demonstration, survey demonstration and land saving evaluation, project plan has been analyzed. The scientific decisionmaking of site selection and route selection has been achieved. The recommended plan has been clarified, and the planning route has been optimized. From the aspects of policy background and restrictive factors, planning and site selection work have been analyzed. By introducing artificial intelligence and big data technology, the method of longdistance pipeline site selection has been optimized. Based on ecosystem service value assessment method, scheme optimization has been carried out. Rationality of the proposed site selection route and related supporting facilities have been determined. It will ensure the route selection meet the planning concept and bottom line control requirements. Relevant thoughts and suggestions have been put forward for the analysis and report preparation of similar longdistance pipeline project land site selection and route selection.