With　the　development　of　5G　communication,　massive　multiple　input　multiple　output　(MIMO)　technology　is　getting　more　and　more　attention.　Massive　MIMO　uses　a　large　amount　of　simultaneous　transmitting　and　receiving　antennas　to　reduce　power　consumption　and　raise　the　level　of　transmission　quality.　Meanwhile,　the　diversification　of　user　equipment　(UE)　in　the　5G　environment　also　makes　heterogeneous　networks　(HetNets)　more　prevalent.　HetNets　allow　UE　of　different　network　standards　to　access　small　cells,　while　the　base　stations　of　small　cells　access　a　macro　base　station　(BS)　to　form　a　multihop　wireless　heterogeneous　backhaul　network.　However,　how　to　effectively　combine　these　two　technologies　by　efficiently　allocating　the　antennas　of　each　BS　during　the　route　construction　process　of　heterogeneous　wireless　backhaul　networks　is　still　an　important　issue　that　is　yet　to　be　solved.　In　this　paper,　we　propose　an　algorithm　called　preallocated　sequential　routing　(PSR).　Based　on　the　links＇　channel　conditions　and　the　available　antennas　and　location　of　BSs,　it　builds　a　wireless　heterogeneous　network　backhaul　topology　and　adjusts　each　link＇s　transmitting　and　receiving　antennas　to　maximize　total　utility.　Simulation　results　showed　that　the　proposed　algorithm　significantly　improved　the　overall　utility　and　the　utility　of　the　outer　area　of　heterogeneous　networks.