In　recent　years,　the　photoelectronic　conversion　efficiency　(PCE)　of　organic-inorganic　halide　perovskite　solar　cell　(PSC)　devices　has　been　improved　greatly.　However,　these　devices　are　not　very　stable,　and　it　is　hard　to　avoid　the　effect　of　visible　or　ultraviolet　(UV)　light　on　the　performance　decay　of　the　organic-inorganic　halide　perovskite　devices,　and　there　is　rare　report　on　the　evolution　process　of　the　microstructure　of　PSCs　under　the　light　illumination,　let　along　discussing　on　the　different　degradation　mechanism　of　PSCs　between　the　UV　and　visible　light　soaking.　To　address　these　scientific　issues,　in　this　study,　we　compared　the　performance　evolution　of　CH3NH3PbI3　(MAPbI(3))　based　PSCs　during　the　UV　and　visible　light　irradiation.　The　experimental　results　show　that　the　perovskite　layer　has　been　photodegraded　from　MAPbI3　into　an　amorphous　phase　under　the　white　light　LED　soaking.　Meanwhile,　the　migration　of　Au　element　from　the　electrode　into　the　interface　between　MAPbI(3)　and　SnO2　layers　can　also　be　captured.　As　comparing　the　kinetics　of　redox　reaction　of　Au,　we　found　that　the　formation　rate　of　Au　nanoparticle　mass　in　PSCs　under　UV　light　irradiation　is　almost　30　times　higher　than　that　under　visible　light　illumination.　Considering　on　the　different　characteristics　of　microstructure　evolution　in　PSCs　under　the　UV　and　visible　light　irradiation,　and　theoretically　analyzing　the　energy　level　of　each　functional　layers　in　the　device,　the　results　confirm　that　UV　light　is　easy　to　be　adsorbed　by　electron　transportation　layer　(ETL)　of　SnO2　to　excite　the　electron-hole　pairs,　while　the　photo-excited　holes　have　a　low　energy　level　of　-8.4　eV,　which　could　oxidize　the　iodide　ions　(I-)　into　atomic　iodine　(I　atom).　The　I　atoms　would　diffuse　into　the　spiro-OMeTAD　layer　and　metal　electrode　interface.　Due　to　its　strong　oxidation　property,　the　I　atom　would　not　only　destroy　the　spiro-OMeTAD　layer,　but　also　oxidize　the　Au　metal　electrode　into　AuI,　which　accelerated　the　generation　of　Au+.　However,　under　the　illumination　of　visible　light,　it　is　hard　to　excite　the　electron-hole　pairs　in　SnO2,　which　prevents　the　damage　on　the　functional　interfaces,　and　the　transportation　energy　barrier　is　unchanged.　So,　the　open　circuit　voltage　(V-oc)　has　a　long-term　photo-stability.　However,　the　short-circuit　current　density　(J(sc))　decreased　rapidly　under　visible　light　illumination,　which　is　mostly　ascribed　to　the　changes　of　charge　mobility　resulting　from　the　migration　of　Au　element　and　photodecomposition　of　MAPbI(3)　layer.　All　these　results　give　a　new　insight　to　understand　the　photo-instability　of　PSC.