The action of snake venoms from 3 different kinds of Korean venomous species (Agkistrodon halys brevicaudus, Agkistrodon saxatilis, Agkistrodon ussuriensis) on the haemostasis and fibrinolytic system was studied and compared with other two venoms of Agkistrodon rhodostoma, Malayan Pit Viper and Agkistrodon halys blomhoffi, Japanese Mamushi. The coagulation activity, fibrinolytic, fibrinogenolytic, and amidolytic activity were determined. Fibrinogen clotting activity in the venoms of Agkistrodon saxatilis and Agkistrodon ussuriensis were 1.0 and 3.5 NIH U/mg. However, it was not able to detect the fibrinogen clotting activity from. the venom of Agkistrodon halys (Korean Salmosa) during prolonged incubation. Polyacrylamide gel electrophoretic patterns of these venoms were quite different from each other. After removal of SDS from the gel with Triton X-100, the fibrinolytic activities in the gel could be directly detected by the fibrin-agar zymographic assay method. The venom of Agkistrodon halys has shown at least two distinct fibrinolytic enzymes (51 Kd and 33 Kd, Agkistrodon saxatilis has three (47 Kd, 33 Kd, and 28 Kd), and Agkistrodon caliginosus has two (38 Kd and 33 Kd). No plasminogen activation activity was observed in any of the venoms of Korean poisonous snakes.