1. Objectives The purpose of this study was to evaluate whether use of Yeoldahanso-tang(熱多寒少湯) may injure the liver function. We clinically studied the change of liver function rest in patients who were admitted in Dongseo Oriental Medical Hospital. 2. Methods We analyzed rhe serum alkaline phosphatase(AIP), aspartate aminotransferase(AST), alanine aminotransferase(ALT), ${gamma}$-glutamyl transpeptidase(${gamma}$-GT), total bilirubin of 25 patients from 1st. July. 2004 to 15th. October. 2007 admitted in Dongseo Oriental Medical Hospital. Liver function test were done on admission and before discharge. 3. Results For most patients, the values of AIP, AST, ALT, ${gamma}$-GT and total bilirubin were within normal range or decreased. 4. Conclusions This study suggests that Yeoldahanso-tang(熱多寒少湯) does not injure liver function of human.