In　this　paper,　the　spatial　coordination　beamforming　scheme　is　proposed　to　reduce　the　serious　intercell　interference　in　ultra　dense　network　(UDN).　Firstly,　the　multi-objective　optimization　model　of　coordination　beamforming　system　is　presented.　Then,　the　optimal　beamformer　of　the　optimization　problem　is　achieved　by　convex　optimization　algorithm.　Further,　considering　the　limitations　of　the　implementation　of　the　optimal　beamformer,　the　linear　suboptimal　beamformer　is　designed　which　is　consisting　of　the　signal　leakage　noise　ratio　based　beamforming　steering　vector　and　optimal　power　allocation.　Simulation　results　show　that　the　proposed　suboptimal　beamformer　can　effectively　suppress　intercell　interference　and　improve　system　capacity.　©　2016,　Editorial　Board　of　Journal　of　the　University　of　Electronic　Science　and　Technology　of　China.　All　right　reserved.