Abstract: Objective To study the expression levels of monokine induced by interferon-γ(Mig) mRNA and its association with HBV DNA and alanine aminotransferase(ALT) in patients with chronic hepatitis B.Methods The level of Mig mRNA in peripheral blood mononuclear cells(PBMCs) was dynamically detected with real-time quantitative PCR,and the ratio of chemokine/GAPDH was considered to represent the final chemokine level.The plasma level of was measured by enzyme-linked immunosorbent assay(ELISA).Results The mean level of Mig mRNA in PBMCs of the patients with chronic hepatitis B was 0.6883±0.0693,which was significantly higher than that in normal controls(P<0.001).The plasma Mig level in the patients was 609.6±73.8 pg/ml,also significantly higher than that in normal controls(P<0.05).In patients with chronic hepatitis B,the level of Mig mRNA in the PBMCs was significantly correlated with plasma Mig level(r=0.7157,P<0.001),and plasma Mig level was correlated with plasma ALT level(r=0.7220,P<0.001) and plasma HBV DNA level(r=0.7266,P<0.001).Conclusion Both the expression of Mig mRNA in PBMCs and plasma Mig concentration are elevated in patients with chronic hepatitis B.Mig plays an important role in migration of the inflammatory cells to the liver and mediates the development of chronic hepatitis B.