A 23 y/o male patient with history of chronic viral hepatitis B suffered from acute attack, Spleen yang vacuity patterns was diagnosed by analyzing the symptoms and sign of this patient in view of Chinese medicine. After receiving treatment with Huang-Qi-Jian-zhong-tang to warm yang and supplement spleen, the liver function (GOT/GPT) went normal. To treat chronic viral hepatitis B with Huang-Qi-Jian-zhong-tang is not often.