While　the　“amorphous　to　crystalline”　transformation　process,　which　has　significant　potential　for　application,　has　been　widely　studied,　the　microscopic　mechanism　on　the　nanometer　scale　is　not　fully　understood.　In　contrast　to　common　heat-driven　phase　transformations,　the　present　study　demonstrated　the　force-driven　moisture-mediated　nanocrystallization　of　perovskite　CsPbBr3　precipitated　from　a　glass　matrix.　In　the　present　case,　the　breakage　of　the　glass　network　under　shearing　force　produces　high-energy　sites　to　absorb　H2O　molecules/clusters　from　ambient　moisture,　and　the　hydration　process　promotes　the　crystallization　process.　Microscratch　analysis　combined　with　confocal　laser　scanning　microscopy　revealed　that　the　distribution　of　CsPbBr3　nanocrystals　almost　reproduced　that　of　the　localized　stress　field　and　clearly　reflected　the　crack　propagation　pathways.　The　potential　applications　of　perovskite　glass　in　the　optical　sensing　of　force　and　moisture　are　also　explored.　Our　findings　provide　insight　into　crystal　nucleation/growth　in　glass,　as　well　as　understanding　the　dynamics　of　crack　propagation　during　the　brittle　fracture　process.　(Figure　presented.)　©　Science　China　Press　2024.