In this decade, the production of penaeids using the traditional open pond method decreased seriously due to disease that spread via seawater. In order to prevent the introduction of pathogenic microorganisms from seawater, industrial shrimp farming system was rapidly constructed. With the continued development of industrial shrimp farming, there is an increasing need to improve our knowledge of behavioral ecology of penaeid shrimps cultured in hi ghdensity farming system. The aim of the present study is to observe the feeding, cannibalism, locomotion, spacing, attacking and defence of Fennerope naeus chinensis and Litopenaeus vannamei postlarvae cultured in highdensity environment at (22±1) ℃. The effects of aeration on behavior of F.chinensis and L.vannamei postlarvae were also investigated. The results indicated that F.chinensis and L. vannamei postlarvae both showed preference for juvenile Artemia. F. chinensis postlarvae appeared frequently cannibalism, active, obvious spacing and highfrequently attacking. L. vannamei postlarvae appeared less cannibalism, less active, unconspicuous spacing and lowfrequently attacking. Furthermore, aeration had a significant effect on the behavior responses of two species. These behavioral strategies will further develop our understanding of the behavioral ecology of penaeid shrimps as well as define the optimal conditions for their highdensity aquaculture and design the feeding regimes in these species.