The composition, distribution, and abundance of copepods collected from surface waters of Kaohsiung Harbor were examined. Copepods were collected quarterly at 7 designated stations from Jan. 1999 to Oct. 2001. In the inner harbor, 58 species in 28 families of copepods were recorded; the average abundance was 1.45 x 105 individuals/1000 m3. The 7 dominant species, which made up 66.6% of the overall collection, were Temora turbinata (18.5%), Acartia erythraea (16.4%), Paracalanus parvus (16.2%), P. aculeatus (6.4%), Pseudodiaptomus marinus (4.3%), A. negligens (2.7%), and A. spinicauda (2.1%). While A. erythraea and P. parvus were abundant at the inner harbor stations, T. turbinata was found mostly at one of the 2 outer harbor stations. Two-way ANOVA analysis of total abundance showed a significant seasonal effect (F = 6.83, p < 0.01), but not between stations (F = 0.24, p > 0.05). Multidimensional scaling (MDS) analysis of each cruise revealed an abundance difference with a low in July and a high in Apr. It also distinguished 1999 as a low abundance year. The range of the species diversity index (H , ) for each cruise was 1.21 to 3.79, with an average of 2.78 ± 0.59. The species diversity index was generally similar between stations, but was lower in Jan. and higher in Oct..