In a millimeter wave massive Multiple-Input Multiple-Output（MIMO）system

hybrid precoding has become a hot research topic because it can greatly reduce the use of radio frequency links

and solve the hardware loss caused by full digital precoding.In addition

the performance is close to full digital precoding.This paper proposes to use an adaptive connection network

using Zero-Forcing（ZF）algorithm in both analog and digital domains

which can further reduce the hardware costs.The proposed algorithm is simulated on the Rayleigh fading channel and the sparsely scattered millimeter wave channel.The simulation results show that the proposed algorithm can achieve better performance in the adaptive connection network structure

and has higher spectral efficiency than the same structure adaptive algorithm.It also shows that the performance is closer to full digital precoding.