Abstract: Through the investigation into the energetics of a typical case of Northeast cold vortex it has been found that distinct features exist for different periods. Before the development of the cold vortex, the transformation among various energies and the variations of the boundary transfers are small. In the early developing stage of the cold vortex, the effect of boundary transfer of the eddy kinetic energy (EKE) is very important. Afterward the eddy available potential energy (EAPE) by the diabatic heating and the transformation from the zonal average kinetic energy to the EKE also increase rapidly. These fact or slead to the intense development of the cold vortex.