Abstract: There is a certain distance between the inclinometer and the drill bit, which makes it impossible to measure the borehole parameters directly. In the construction process of directional well of coalbed gas, there is a situation in which the straight section of the straight -steady-state two dimensional directional well is diagonally tilted, which makes the deflection point have a deviation angle and azimuth angle. Based on the field drilling engineering, this paper analyzes and summarizes the function relationship between the tool face and the change of hole drift angle and azimuth angle. This makes it possible to predict the trajectory accurately. A set of directional well trajectory control technology is proposed and verified in the construction of multi-well in the area.