AIM: To investigate the anti-DIC effect of the domestic recombinant hirudin (rH) in order to provide preclinical pharmacological basis for its new drug application. METHODS: DIC was induced by constant iv infusion of thrombin (100 U?kg -1 ?h -1 ?1 h) plus PAMBA (50 mg?kg -1 ?h -1 ?1 h). Platelet count (PLT), PT and fibrinogen (FIB) determination as well as plasmaprotamine paracoagulation (3P) test served as diagnostic indexes of DIC, while pathlogical examination of microthrombosis of lungs and kidneys was followed. RESULTS: rH 125,62.5,31.25 and 15.625 ?g?kg -1 iv. gtt demonstrated a dose-dependant inhibitory effect on DIC. The inhibitory effects on DIC of rH(%) were 89.38%, 52.60%, 49.71% and 25.58% for PT, and 100.01% , 61.86%, 58.40% and 32.68% for PLT, and 85.22%, 73.01%, 33.60% and 14.86% for FIB respectively at the descending order of rH doses. CONCLUSION: Domestic rH being tested has powerful anti-DIC effect which is comparable with refludan—an r-hirudin product approved by European Community for marketing.