With the disk reflectivity optional and with the recording information distribut ion discretionary, this paper analyzes the readout and crosstalk in photochromic dual-wavelength storage, establishes the models for them, and presents a method to reduce the readout crosstalk. It shows that as the crosstalk of the readout of a laser corresponding to a certain material is canceled, the parameter of the method is determined only by the molar extinction coefficient of the other mate rial, and the parameter is irrelative to the disk reflectivity distribution and the recording information, even irrelative to the molar extinction coefficient of the former material. This point is validated in the readout crosstalk cancelin g experiments with the two kinds of diarylethene with different absorption spect ra.