A new method for measuring the aircraft’s 3D attitude based on intersection measurement，direction vector method of angle bisector lines, was presented. The coordinates of two suitable points in the edge character lines were acquired separately through the edge detection and character line for two digital images, then,the coordinates were transformed two times into a specific coordinate system. By combining the parameters of photoelectrical theodolite and tracked pitching and azimuth angles, the direction vectors of airfoil’s edge character lines in the specific reference coordinates were determined. Furthermore,by using the aircraft’s symmetry, the direction vectors of two angle bisector lines in the plane restricted by the two airfoil’s edge character lines were solved, and the vectors of axial line and its vertical line were reconstructed. Depending on operation above, the pitching, yawing and roll angels of the aircraft were obtained.An example for cobra maneuver flying tracked by two sets of photoelectrical theodolites in intersection indicates that the above-mentioned method is steady, valid and practicable. The error of angles can be limited within 1° if the image of airfoil’s edge character lines is clear. Obtained results show that the method not only provides a new way to deal with the optical measuring images, but also gives a reference for measuring poses of other moving objects.