Filling hole is a kind of vertical drilling hole with high precision, drilling hole trajectory can not be controlled by the conventional drilling method under the conditions of formation deflection-promoting and large natural bending. By using directional drilling and MWD technology, the drilling trajectory in the whole construction process can be monitored and extended according to the trajectory design. The paper introduces the design of directional drilling, MWD, drilling hole straightening and sidetracking in the filling hole construction.