The　chlorine　evolution　reaction　(CER)　is　essential　for　chlorine　(Cl2)　production.　However,　the　catalyst　deactivation　and　side　reaction　oxygen　evolution　reaction　(OER)　are　still　serious　problems　for　CER.　Improving　the　stability　and　selectivity　of　catalyst　for　long　term　electrocatalytic　reaction　in　large　current　density　is　highly　desired.　In　this　work,　a　self-supporting　Ti/RuO2@TiO2　nanotubes　(NTs)　electrode　had　been　developed　by　cosputtering　titanium　(Ti)　and　ruthenium　oxide　(RuO2)　onto　the　high-ordered　titanium　dioxide　(TiO2)　nanotubes　substrate.　This　process　produced　a　well-distributed　incorporation　of　Ti　species　within　the　RuO2　coating.　It　has　revealed　that　the　presence　of　Ti　element　optimizes　the　surface　morphology　of　electrode　and　modulates　the　electronic　state　of　ruthenium　(Ru)　species,　effectively　preventing　over-oxidation　and　thereby　enhancing　stability.　The　Ti/RuO2@TiO2　NTs　self-supporting　electrode　exhibits　remarkable　electrocatalytic　activity　for　CER,　evaluated　by　lower　overpotential　(58　mV)　at　10　mA　cm-2　and　reduced　Tafel　slope　(78　mV　dec-1)　than　that　of　other　electrodes.　Moreover,　its　mass　activity　achieving　478　mA　mgRu　-1　at　1.3　V　(vs　SCE)　is　4.3　times　that　of　commercial　dimensionally　stable　anodes　(DSA).　After　operating　for　approximately　150　h　at　100　mA　cm-2,　the　electrode　exhibits　minimal　performance　degradation,　underscoring　its　exceptional　stability.　Additionally,　the　large　potential　difference　between　CER　and　OER　makes　it　maintain　high　Cl2　selectivity,　achieving　up　to　91　%　across　varying　current　densities　and　reaction　times.　This　work　provides　valuable　strategy　for　designing　novel　Ru-based　catalysts　for　practical　CER　applications　in　seawater　and　industrial　environments.