Controlling　the　friction　coefficient　is　crucial　for　smart　friction　management　and　the　reduction　of　energy　consumption.　The　exploration　of　the　mechanisms　for　regulating　friction　coefficients　is　at　the　core　of　this　issue.　In　this　study,　it　is　proposed　that　microviscosity　plays　a　pivotal　role　in　influencing　the　rapid　response　of　the　friction　coefficient　variation　in　polymer-water-based　lubrication　systems.　The　change　in　microviscosity　induced　by　salt　ions　was　investigated　using　fluorescent　probes　and　molecular　dynamic　simulation.　The　friction　contact　region　was　divided　into　core,　corona　and　blank　regions　based　on　functional　specificity　to　investigate　microviscosity.　The　results　of　the　study　showed　that　the　microviscosity　exhibited　by　salt　ions　which　are　more　readily　adsorbed　in　the　corona　region　is　the　key　to　determining　changes　in　the　friction　coefficient.　The　high　microviscosity　in　the　core　region　of　the　polymer　coating　serves　as　the　basis　for　maintaining　a　low　friction　coefficient.　The　blank　region　ensures　low　shear　viscosity　during　friction.　Therefore,　the　regulation　of　the　friction　coefficient　can　be　achieved　by　controlling　the　microviscosity　in　the　corona　region　using　salt　ions.　This　study　not　only　presents　a　novel　method　for　characterizing　microviscosity　but　also　establishes　a　theoretical　basis　for　the　intelligent　regulation　of　friction.　©　2024