Focused on Ge-based InAs QD lasers, influence of catastrophic optical damage (COD) on InAs QD lasers was investigated. Based on the study, a new process for cavity surface recovering of edge emitting lasers damaged by COD was presented, thus the InAs quantum dot laser on Ge damaged by COD was restored successfully. The corrosion process was designed according to material structure of Ge-based InAs quantum dot laser, and cantilever structure was prepared on the laser cavity surface by using selective corrosion. By using fine needle cleavage, the cantilever structure was naturally cleavaged, thus a new laser resonant cavity surface was obtained, and the failure laser was reactivated. The performance of the lasers before failure and after regeneration was compared, and it indicated that the Ge-based InAs quantum dot lasers which are disabled by catastrophic optical damage obtain new cavity surface. And the performance of Ge-based laser devices is almost the same before and after failure.