Abstract: Soil salinization is a major environmental challenge that is threatening the sustainable development of agricultural ecology around the world. It is of great theoretical and practical significance for increasing crop yield and making full use of saline and alkaline land to study the salt tolerance mechanism of plants, innovating new approaches to improve salt tolerance of plants, and breeding new salt tolerant varieties. This paper summarizes the research progress in the regulation mechanism of plants to salt stress and the methods to improve salt tolerance of plants, and points out the technical barriers and problems that need to be solved for the promotion of plants in saline and alkaline lands, which provides guidelines for the protection and utilization of saline and alkaline lands, as well as the improvement of crop yield and quality.