Abstract: Packer is mainly in the process of grouting will wait for drilling in accordance with the design requirements of the grouting space, used to implement the segmented grouting, the slurry into the design of rock fracture or pore inside, even at the same time with the drilling borehole wall form a seal to prevent slurry returns, etc. Is one of the key equipment in the grouting engineering construction. In view of the present our country there is no effective grouting sealing equipment about deep level bare hole, developed hydraulic setting packer, achieved in cross grouting sealing equipment. This paper introduces the packer structure composition and the working principle, and the current domestic coal mine shaft surface pre grouting comparing several packer, analyses the characteristics of its use.