Effects of polyelectrolyte flocculation on centrifugal dewatering of waste activated sludge were discussed in this study with the assistance of a newly proposed centrifuge, which mimicked a one-dimensional centrifugal dewatering process. The moisture removal efficiency was enhanced by the flocculation and increasing rotational speed. For flocculated sludges, dewatering stage is predominated to moisture removal and further compaction of the loose cake.