Abstract: In this paper, the methods of transfer alignment of inertial navigation system （INS） are divided into two classes according to their fundamental principle of alignment. One can be called calculating parameter matching, such as velocity matching and position matching. Another can be called measuring parameter matching, such as acceleration matching, attitude matching and angular rate matching. This paper points out that the calculating parameter matching is simular to the self-alignment on stationary base and the spatial rate alignment, it takes long time required for alignment when the vehicle has no maneuver, and the measuring parameter matching takes less time required for alignment,but the accuracy of alignment is affected by vehicle elastic deformation.