Abstract: A high wal mining fechnology would be favorable to mine retained coal in the high wall of the surface mine,outcrop on the hillside,shallow seam and other seam uneconomic mined by the conventional technology. In order to maximallysafely and high efficiently excavate the calresources in the high wall of the surface mine,in combination with the geological conditions of the seam in the highwall of Tela Bula Surface Mine.the FLAC~(3D)software was applied to simulate and analyze the development features of the plastic zone when the coal plla width was diferent. The theoretical analysis combined with the site experiment study showed that the rational coal pilar width under the road was determined to be1.7 m and the coal pillar width under the slope at a side of the road was determined to be 1.3 m.The EBH132 boom type roadheader was appliedto a remote controlled mining trial at the site. The resulis showed that the personnel working efficiency was 17.6 tday per man ,the recovery rateof the coal resources left in the highwall was over 67% and the safety and high efficient mining of the retained coal resources left in the high-waof the surface mine was realized.