Metallic　zinc　is　an　excellent　anode　material　for　Zn-ion　batteries,but　the　growth　of　Zn　dendrite　severely　hinders　its　practical　application.Herein,an　efficient　and　economical　cationic　additive,poly　dimethyl　diallyl　ammonium(PDDA)was　reported,used　in　aqueous　Zn-ion　batteries　electrolyte　for　stabilizing　Zn　anode.The　growth　of　zinc　dendrites　can　be　significantly　restrained　by　bene-fiting　from　the　pronounced　electrostatic　shielding　effect　from　PDDA　on　the　Zn　metal　surface.Moreover,the　PDDA　is　preferentially　absorbed　on　Zn(002)plane,thus　pre-venting　unwanted　side　reactions　on　Zn　anode.Owing　to　the　introduction　of　a　certain　amount　of　PDDA　additive　into　the　common　ZnSO4-based　electrolyte,the　cycle　life　of　assembled　Zn||Zn　cells(1　mA·cmr-2　and　1　mAh·cm-2)is　prolonged　to　more　than　1100　h.In　response　to　the　perfo-ration　issue　of　Zn　electrodes　caused　by　PDDA　additives,the　problem　can　be　solved　by　combining　foamy　copper　with　zinc　foil.For　real　application,Zn-ion　hybrid　super-capacitors　and　MnO2||Zn　cells　were　assembled,which　exhibited　excellent　cycling　stability　with　PDDA　additives.This　work　provides　a　new　solution　and　perspective　to　cope　with　the　dendrite　growth　problem　of　Zn　anode.