Abstract:Aiming at the situation of attitude measurement with the photoelectric theodolite and the radar in the different site, we search and distinguish the real target by using genetic algorithm and Lagrange interpolation method, then Angle and the distance information can be take into accounted in the same line, at last, attitude angle can be obtained. This method is not only suitable for attitude measurement of all kinds of large target, also suitable for trajectory measurement of all kinds of target. As a supplement for measure and control technology, it has certain theoretical value and practical value in the testing-field.