Internet　addiction　may　arise　from　multiple　factors　and　personality　tendencies　have　been　previously　implicated.　Prior　studies　have　found　that　extraversion　may　be　a　protective　factor　mitigating　against　internet　addiction,　yielding　a　＂rich-get-richer＂　effect.　However,　few　studies　have　explored　how　extraversion　may　influence　internet　addiction　from　the　perspective　of　online-offline　integration.　Drawing　on　a　sample　of　428　college　students,　the　current　study　examined　a　serial　mediation　model　exploring　the　underlying　mechanisms　of　how　extraversion　may　statistically　predict　internet　addiction　through　online-offline　integration　and　antecedent　factors.　The　serial　mediation　model　analyses　indicated　that　extraverted　internet　users　exhibited　a　weaker　preference　for　online　anonymity　and　less　online　extraversion　compensation,　thus　formulating　a　higher　level　of　online-offline　integration　than　introverted　individuals,　which,　in　turn,　appeared　to　reduce　the　risk　of　internet　addiction.　In　contrast,　with　regard　to　specific　components　of　online-offline　integration,　introverted　internet　users　preferred　online　anonymity,　which　reduced　their　relationship　integration　and　increased　their　likelihood　of　internet　addiction;　similarly,　the　introverted　individuals　were　also　more　likely　to　exhibit　an　extraversion　compensation　effect.　That　is,　they　were　more　extraverted　on　the　internet　than　in　general;　hence,　they　had　a　lower　level　of　self-identity　integration,　resulting　in　a　greater　likelihood　of　experiencing　internet　addiction.　These　results　highlight　the　importance　of　online-offline　integration　that　may　account　for　personality　variations　in　social　and　psychological　outcomes　related　to　internet　use,　and　suggest　a　role　for　online　anonymity　preference　and　extraversion　compensation　in　influencing　specific　components　of　integration.