Investor　and　media　attention　play　a　significant　role　in　stock　markets,　and　internet　attention　has　been　used　as　a　proxy　for　investor　and　media　attention　to　explore　their　influence　on　fluctuations　in　stock　prices.　This　study　relied　on　the　Qihoo　360　search　index　to　investigate　the　effects　of　investor　and　media　attention　in　the　Chinese　stock　market.　We　used　three　major　information　asymmetry　measures　to　explore　whether　investor　and　media　attention　were　relevant　for　stock　market　information　asymmetry.　Our　empirical　results　reveal　that　investor　attention　accelerates　information　dissemination　into　stock　prices　and　reduces　information　asymmetry　significantly.　However,　after　investor　attention　and　other　control　variables　are　controlled　for,　the　effect　of　media　attention　is　trivial.　The　results　confirm　that　internet　attention　facilitates　forecasting　market　performance　in　the　Chinese　stock　market.　(C)　2018　Elsevier　B.V.　All　rights　reserved.