Alloy 617 is identified as one of candidate materials for structural components such as internal heat exchanger (IHX) and hot gas duct (HGD) in a very high temperature reactor (VHTR). Since the components are designed to last for up to 60 years at elevated temperatures, they may cause creep failure owing to creep damage during the long service life. Thus, it is important to predict the long-term creep life for Alloy 617. In this study, a number of creep rupture data were collected through world-wide literature surveys and the data tested in KAERI, and using these data, the long-term creep life was predicted in terms of two methods of typical Larson-Miller (L-M) parameter and probability distribution method (PDM). The PDM proposed by Weibull distribution was found to be better agreement in creep life prediction than the L-M method. The L-M method showed overestimation for longer time of low stress region, but the PDM revealed reasonable prediction which gradually decreased in creep strength for longer time of low stress region.