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We employ the methods of machine learning to study the many-body localization (MBL) transition in a 1D random spin system.By using the raw energy spectrum without pre-processing as training data,it is shown that the MBL transition point is correctly predicted by the machine.The structure of the neural network reveals the nature of this dynamical phase transition that involves all energy levels,while the bandwidth of the spectrum and nearest level spacing are the two dominant patterns and the latter stands out to classify phases.We further use a comparative unsupervised learning method,i.e.,principal component analysis,to confirm these results.