There　are　still　no　convincing　conclusions　on　the　effect　of　workplace　ostracism　in　previous　study.　So　we　try　to　compare　the　relationship　between　workplace　ostracism　and　the　positive/negative　part　of　employee　behavior　to　solve　this　problem.　Specifically,　based　on　571　survey　samples　collected　through　several　southern　provinces　in　China,　this　paper　empirically　investigates　the　role　workplace　ostracism　plays　in　the　behavior　of　employee　silence　in　the　era　of　knowledge　economy.　Meanwhile,　it　explores　the　function　of　moderator　in　task　interdependence　which　is　widespread　nowadays.　There　are　two　research　findings　of　this　paper:　(1)　workplace　ostracism　has　a　significantly　positive　impact　on　the　behavior　of　employee　silence,　and　ostracism　does　more　harmful　than　good　to　the　survival　and　development　of　organization;　(2)　task　interdependence　moderates　the　relationship　between　workplace　ostracism　and　acquiescent/defensive　silence.　To　be　more　specific,　the　higher　the　task　interdependence　is,　the　stronger　the　impact　of　workplace　ostracism　on　employee　acquiescent/defensive　silence　is.