Objective:To study the clinic epidemic of Budd Chiari Syndrome in Shandong Province,so as to research the causes and pathogenesis.Material and Methods:To collect the credible clinic data of 1592 patients in Shandong Province from 1997 to 2006.According to the pathologic location,patients were divided into four types—hepatic small vein(HSV),hepatic main vein( HMV),inferior vena cava(IVC) and HMV combined with IVC(CHI).And the age,sex,medical record and clinical feature were descripted.Results:The cases increased in the last decade years,especially in adults .The incidences in male and female were equal.The cases of the IVC type were the most(57.2%,911/1592),then CHI type(28.5%,454/1592),HMV type(13.4 %,214/1592) and HSV type(0.8%,13/1592).The course of the HSV type was acute .In HMV type,most of the course was chronic,and IVC type and CHI type were chronic.The HSV type had clear cause,and 19.6% of the HMV type were related with coagulation abnormalities.Causes of IVC type and CHI type were not clear.Conclusion:In Shandong Province,the main types are IVC type and CHI type,with special clinic character and unknown causes.