There are three species turtles distributed over Hubei (Trionyx sinensis, Chinemys reevesii and Cuora flavomarginata). From March 1984 to February 1985, 24B specimens of Trionyx sinensis, 40 specimens of Chinemys reevesii and 25 Cuora flavomarginata were examined. Two species of trypanosomes and 6 species of haemogregrines have been recorded from these turtles. All of them are new species. They are Trypanosoma trionyxis sp. nov. from Trionyx sinensis, Trypanosoma chinemydis sp. nov. from Chinemys reevesii, Haemogregarina sinensis sp. nov., Haemogregarina hupehensis sp. nov., and Haemogregarina galeata sp. nov. from Trionyx sinensis, Haemogregarina chinemydis sp. nov. and Haemogregarina botuliformis sp. nov. from Chinemys reevesii, Haemogregarina cuorae sp. nov. from Cuora flavomarginata. The life history of Haemogregarina sinensis had been observed. Its vertebrate host is Trionyx sinensis, and its vector is Mooreotorix cotylifer. The life history may be divided five developmental stages: gamogony and sporogony in the leech, tissue schizogony, deep erythrocytic schizogony, and peripheral erythrocytic schizogony occured in Trionyx sinensis. Merozoites, sporozoites and trophozoites can move out of the erythrocytes, especially trophozoites. Their movement usually expressed three forms: Sliding, rotation and folding. Haemogregarines are usually observed in red cells. But sometimes they also appeared in leucocytes, especially at highgrade infection. The stain reaction of the parasites in leucocytes was innormal. So it was probably the cell immunity reaction of host to parasites. Hyperparasitism was common. Any developmental stages can be observed in one cell. From May to september the parasitemia level of Haemogregarine sinensis was the highest. There was certainly relation between the maturity of host and parasitemia level. Infection of haemogregarines can cause enlargement, deformity of host cells, and the nuclei were displaced. Especially in the period of schizogony, mass erythrocytes were destructed. It is compensated by the release of young erythrocytes. As in some seasons a high percentage of erythrocytes is destructed by haemogregarines, the ability of blood to fullfill its respiratory function considerably decreases At the same time, the percentage of granulocytes is increased, lymphocytes have a high number of pseudopods, which indicates increased physiologic activity of cells.