Abstract: The geological disasters caused by rare earth mined-out area have serious endangerment for the construction and operation of highway. Aiming at a specific gob subgrade strengthening projects,and combining with the geological conditions and engineering requirements,a method of cement-soil grouting reinforcement is put forward and applied to practical engineering. Test results show that good grouting effect is achieved with the slurry filling the mined-out area and consolidating the soil well and the soil mass stability being improved to meet the specification requirement. Therefore,the method of cement-soil grouting has good feasibility and applicability for the reinforcement of the rare earth mined-out area.