This study was based on logbooks of Taiwanese otter trawlers fished in the southern part of East China Sea in conjunction with operation information obtained from fishing captains. Catch data of bottom otter trawl in the 1980s were then separated and used for investigating yearly dominant species and community indicators of groundfish resources.Yearly dominant species were: cuttle fish (Sepia spp.), squid (Loligo spp.), shrimp (Penaeus spp.), hair tail (Trichiurus spp.), sea eel (Muraexesox spp.), lizard fish (Sauruda spp.), white croaker (Argyrosomus argentatus) and white pomfret (Pampus argenteus); diversity indices were also obtained and indicated a slightly downward trend toward late 1980s. Indicators as first canonical variate, which appeared a similar trend as those of diversity indices, and second canonical variate were also provided in this study. A two dimensional plot of these two canonical variates can provide trends of not only the composition of components but also the standardized CPUE trends of its components.