Objective To explore the depression status and its con-elation with quality of life(QOL) in patients receiving methadone maintenance treatment (MMT). Methods 120 patients treated with MMT were assessed with Quality of Life Scale for Drug Addicts (QOL-DA) and Beck Depression Inventory (BDI-21). Results More than 41 years old group's QOL-DA physical function domain(28.79 ±8.53) was significantly lower than 31～40 years old group (33.52 ± 6. 73) (P= 0.003). According to BDI-21 score ,55% patients receiving MMT were classified as moderate or severe depression. QOL-DA scores decreased in order of the depression severity classified as no depression group,mild depression group,moderate depression group and severe depression group according to the BDI-21 score,and the difference between the groups were significant statistically (P<0.01). There was significantly negative correlation between BDI-21 score and QOL-DA score (P<0.01). Conclusion Depression is very common in opioid dependent patients receiving MMT and decreases their quality of life,so it is important to enhance depression intervention or treatment in MMT clinics.