The　dynamic　process　of　ions　transport　in　electrochromic　WO3　film　is　usually　studied　by　electrochemical　impedance　spectroscopy.　However,　the　detailed　features　are　hidden　since　the　ions　insertion　into　WO3　is　a　very　complex　process　including　structural　deformation　and　phase　transformations.　Chronopotentiometry　is　an　electrochemical　characterization　method　that　measures　the　response　potential　of　a　system　under　an　imposed　current.　Compared　to　other　dynamic　characterization　methods　(impedance　spectroscopy　and　CV),　it　allows　direct　access　to　the　voltage　contributions　in　different　states　of　the　solution-electrode　system　and　has　frequently　been　used　to　investigate　kinetic　effects　such　as　adsorption　and　transport　phenomena　near　electrode　surface.　In　this　study,　chronopotentiometry　is　creatively　applied　to　study　ion　transport　kinetics　and　control　ions　insertion　behavior　in　electrochromic　WO3　film.　The　results　suggest　that　a　large　ions　insertion　flux　at　the　interface　of　WO3/electrolyte　could　broaden　ions　transport　channels　due　to　the　fierce　lattice　expansion　during　Li+　ions　insertion　process,　which　further　improves　the　ions　transportation　kinetics　and　gifts　a　fast　switching　speed　of　optical　performance.　However,　the　repeating　ions　insertion/extraction　behaviors　at　the　interface　of　WO3/electrolyte　for　the　long-term　cycle　process　can　reduce　the　size　of　WO3　grains　as　a　＇ball　mill　effect＇.　Especially,　a　large　ions　transport　flux　can　aggravate　the　＇ball　mill　effect＇.　Consequently,　the　structure　of　the　WO3　film　becomes　very　dense,　which　is　unfavorable　for　ions　transport　and　electrolyte　permeation.　This　dense　structure　also　leads　to　an　irreversible　accumulation　of　Li+　ions　and　LixWO3　in　the　WO3　host　structure,　resulting　in　a　decay　of　optical　modulation　ability　and　electrochromic　activity.　This　work　offers　an　efficient　method　to　analyze　ion　transport　kinetics　in　intercalation　materials　and　a　new　understanding　of　the　relationship　between　ion　transport　behavior　and　cyclic　stability　of　electrochromic　materials.　©　2021,　Science　Press.　All　right　reserved.