According to the very complicated downhole accidents and supplement coring in medium-length and deep hole with wire-line diamond drilling, the bypassing barrier technique by wedge with same diameter of the borehole was summed up by repeated practice. The process of the wedge, the calibration before running down, hole-bottom bridging, setting method, bottom hole assembly, drilling attentions and hole-repairing operation points were emphasized. The technique is helpful to reduce abandoned drilling length with construction cost saving and short construction period.