Soil salinization irrigation in Pingluo county can improve saline-alkali land, but it will also cause secondary salinization of soil. The key is whether irrigation is reasonable. According to the natural and man-made factors of soil salinization in Pingluo county, the necessary measures to prevent soil salinization are put forward: controlling the total amount of water diversion; Improve the irrigation and drainage system engineering; Scientific irrigation; Construction of canal seepage control project.