The　interference　characteristics　studies　of　HgCdTe　infrared　focal　plane　array　(IRFPA)　detector　are　of　great　significance　to　improve　its　application　performance,　but　few　studies　of　laser　interference　have　been　undertaken　on　infrared　detectors　irradiated　by　high-repetition-rate　mid-infrared　supercontinuum　fiber　laser.　In　this　work,　we　used　the　fiber　amplifier　with　48.16　MHz　repetition　rate,　the　3　dB　spectral　bandwidth　of　1.5-3.7　mu　m　and　maximum　average　output　power　of　5　W　to　irradiate　the　HgCdTe　IRFPA　detector.　The　results　showed　that　the　performances　of　detector　were　sensitive　to　laser　power,　and　interference　threshold　was　0.043　W/cm2　and　the　temporary　blindness　threshold　was　0.14　W/cm2　with　multi-pulse　accumulation.　The　interference　mechanism　was　optical　effect　and　thermal　effect　acting　together　on　the　HgCdTe　detector　under　laser　irradiation.　Based　on　twotemperature　model,　the　work　theoretically　simulated　laser-irradiated　temperature　distribution　in　detector　and　the　results　were　approve　the　experimental　conclusions.　The　research　results　provide　theoretical　and　experimental　basis　for　photoelectric　countermeasures,　infrared　guidance　and　other　fields.