By following the relationship of correspondanee between twinning geometry and the rotation matrices, and the combination theorems of rotation operation, it is always possible to reduce the multiple twinning operation of the high order twin to single rotation operations. In this article, we calculated the rotation axis uvw and rotation angle φ 's, by which the reduction of 1-5 order twinning in the fee structure to single rotation operations can be accomplished. In addition, we also give the computing procedure which is appropriate for the automatic analysis of electron diffraction pattern of high order twins by means of a computer.