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Beam training is one of the kernel problems in Millimeter-Wave(mmWave) massive multiple-input multiple-output(MIMO) systems. The beam direction explicitly relies on user location and is implicitly related to channel state information(CSI). Based on this fact, we propose a deep neural network-based novel downlink beam prediction framework to reduce the beam training overhead while achieving higher reliability. Considering that the user location and CSI are two completely different types and dimensions of information, the proposed neural network adopts adjustable feature fusion learning(AFFL) to fuse the two kinds of information. To reduce the beam training overhead, only the user location and the CSI of a minimal number of antennas are taken as the network’s inputs. In addition, when fusing, the signal-to-noise ratio(SNR) is used to adaptively adjust the weights of the two inputs on beam prediction output …