Abstract: The disasters dynamics and security of phosphate was one of the important problems in Phosphorus ore-deposit mining.Based on the site survey and engineering test in Yichang Phosphorus, the collection of physical and mechanical parameters for ore, the research of mine geological conditions and mining structural parameters, the characteristics and the activities laws of ground pressure, the main controlling factors of ground pressure were identified.The fuzzy matter-element model of stability evaluation on ground pressure in empty areas was built and the stability of underground mining partition was analyzed combining practical projects.The evaluation results are consistent with the actual values, which provide some useful reference for the pressure safety study in phosphate rock mass.

Key words: Phosphorus mine, Activity patterns of ground pressure, Fuzzy matter-element method, Stability evaluation