The 3D massive Multiple Input Multiple Output(MIMO) under the Rician channel model is studied, and the easily-implemented transmission scheme with high-spectral efficiency is proposed. The proposed scheme only utilizes the Line-Of-Sight(LOS) channel, as it is easier to be obtained than the scatter channel. Firstly, the user scheduling algorithm is utilized to solve the problem of too much interference between adjacent users, so as to improve the sum rate of the system, and then the precoding method of domain selection is utilized to eliminate the interference between different users and maximize the Signal-to-Noise Ratio(SNR), so as to further improve the system sum rate. The simulation results validate that the proposed scheme has higher spectral efficiency than the previous schemes.