Abstract: A continuous wave DF laser was induced on the PV HgCdTe infrared detectors, under various power density ,the detectors had a serious of output. With the increasing of irradiated laser power density, firstly the detector worked in linear section, then chaos occurred (laser power density about 334mW/cm2) , lastly unstable detector homopolarization was observed(laser power density about 14W/cm2),and the detector recovered to normal working status after the laser was removed. Some explanations about the results were given, as the results were very different from the theoretic expectation, they provide valuable clue for future research on PV HgCdTe.