This paper reports the fining of 26 digenetic trematodes of marine fishes collected from Hainan Island, during autumn (October-November) in 1990 and spring (March-April) in 1992. These 26 species of trematodes were not recorded in the book “Parasite digenetic trematodes from marine fishes in Hainan Island”. Four of the 26 species are considered to be new to science, and are described here. All the measurements are in millimeters but ova in microns. The type specimens are deposited in the Institute of Oceanology Chinese Academy of Sciences in Qingdao.