The present invention provides a method for predicting treatment efficacy of peginterferon plus ribavirin treatment in a subject suffering from chronic hepatitis C comprising: (a) measuring gene expression levels of genes comprising RSAD2, LOC26010, HERC5, HERC6, IFI44, SERPING1, IFITM3 and DDX60 of a blood sample from the subject after one week of the peginterferon plus ribavirin treatment; and (b) calculating a gene score according to cumulative fold change of the gene expression levels, when the gene score is equal to or higher than a cut-off value, the method predicts successful treatment of chronic hepatitis C with the peginterferon plus ribavirin treatment for the subject.