The impacts of ［TCEPMIM］［Cl］, one kinds of ionic liquid containing phosphonium, on the structure and properties of polyurethane grouting materials(PUGM) applied in coal mine were investigated, especially the effects of ［TCEPMIM］［Cl］ on their thermal conductivity and thermal stability. The results reveal that ［TCEPMIM］［Cl］ has obvious effects on the structure formation and properties of PUGM. When the addition amount of ［TCEPMIM］［Cl］ changes from 0%(by mass) to 20%, the thermal conductivity of PUGM increases to 0062 W/(m·K). Additionally, the thermal stability of PUGM increases at first and then decreases with gradually increasing amount of ［TCEPMIM］［Cl］ in PUGM. When the amount of ［TCEPMIM］［Cl］ is 2%, the PUGM presents the highest initial decomposition temperature and the maximum decomposition rate temperature will be at 3003℃ and 3432℃ respectively. The maximum residual mass of decomposed PUGM is 28% when the amount of ［TCEPMIM］［Cl］ is 5%. The PUGM exhibits a higher compressive strength, better antistatic property, excellent thermal conductivity and thermal stability, and then it also has a good flame retardant ability when the added amount of ［TCEPMIM］［Cl］ is 5% in its matrices.