The present invention provides a data code translation method for a light storage system. which is capable of memorizing channel bite array on the disk through partial max response detecting. Different to prior art, this method doesn't directly aim at radio frequency signal to be detected, the value of partial radio frequence signal is adjusted to an ideal radio frequency signal so to decrease error rate of channel bit array. The method includes the following procedures: acquiring the first radio frequency signal array; detecting whether a signal accroding with certain conditions is in the radio frequency signal array or not; adjusting a plurality of signals of the radio frequency signal array into ideal radio frequency signal and forming the second radio frequency signal array; code translation of the secondradio frequency signal array. In one better emobodiment, the code translation method is applied to a partial response channel PR (1, 2, 2, 2, 1) system.