Replacing the Ar + laser with the di ode-pumped solid-state laser (DPL) in the holographic data storage system is t he first step to make it compact.In this article,the increasing cross-talk caus ed by the application of DPL was analyzed experimentally and theoretically.The main reason of the phenomena is the multiple longitudinal modes in the output of the DPL.This result is helpful when choosing and improving the performance of the D PL.