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Anomalous positive magnetoresistance (MR) up to 36％ was observed at 2 K and 12 T in the undoped amorphous carbon (a-C) film deposited on glass substrate by pulsed laser deposition at 500 ℃.There was no tendency of saturation of MR with increase of the magnetic field up to 12 T.The MR decreases as the measurement temperature increases from 2 to 80 K,and could hardly be observed above 80 K.