Abstract: In order to solve the problem of resource waste and environmental pollution caused by phosphorus tailings storage，the experimental study on the modification and preparation of ecological resto⁃ ration soil by phosphorus tailings is carried out by referring to the three-stage filtration modification tech⁃ nology of phosphogypsum and adopting the two-stage filtration + pressure filtration dehydration process.The test results show that the three-stage filtration adopts the pressure filtration mode. Under the conditions of flocculant PAM dosage of 10 g/t，filter cake thickness of 6 mm and phosphate tailings slurry concentration of 50%，the water content of the prepared modified ecological restoration soil is 12.355%，which reaches the storage condition of water content less than 15%，and the dry base capacity is 630 kg/(m2 ·h)，which re⁃ alizes the high-value utilization of phosphate tailings.

Key words: phosphate tailings, phosphorus fixation and fluorine reduction, modified ecological resto? ration soil