Ferroelectrics　that　simultaneously　possess　optical　transparency　and　photochromic　(PC)　behavior　have　attracted　extensive　attention　for　multi-functionality.　However,　inability　to　achieve　both　rapid　and　large　coloration　contrast　in　photo-stimulated　ferroelectrics　limits　their　practical　application.　In　this　work,　we　propose　a　new　strategy　for　realizing　rapid　photochromism　by　constructing　the　intermediate　trap　level　(T-2)　in　Ba/Sm　co-doped　(K0.5Na0.5)　NbO3　(KNN)　ferroelectric　transparent　ceramics.　Specifically,　rapid　photo-response　time　of　about　2　s　was　achieved,　and　the　modulation　ratios　of　transmittance　and　luminescence　intensity　were　37.6%　and　72.6%　within　2　s　for　the　ceramics.　This　highly　responsive　PC　behavior　with　large　coloration　contrast　is　expected　to　broaden　the　application　of　PC　materials　in　optical　devices,　e.g.　photo-sensitive　glasses　and　rewritable　information　displays.