Many copepods have integrated a state of diapause in their life history to avoid the critical conditions. It has been showed that the diapause trait is by no means evenly distributed within copepods, such as different diapausing forms (Diapause occurs in eggs, copepidites or adults.) and different diapausing locations (in water column or in sediment). In this paper we attempt to investigate the distribution of diapause among copepods based on the published data of 102 species from 3 orders of pelagic copepo...