SPCT is a new type of testing method to measure creep life of metallic materials. A dead load is applied into the spherical punch ball to penetrate a small metal sheet specimen. It has several advantages to the conventional UCT such as fingernail-sized specimen (10x10x0.5mm3), short test time, etc. Since the size of the specimen is small, it can be obtained from in-service power plant with semi-destructive way. However, there are some disadvantages that prevents this test to be used in the industrial field and standardization. In this study, therefore, the presenting authors have proposed a stress based creep life evaluation method for SPCT. For verification, Inconel 617 was tested by both UCT and SPCT. Also, a SPCT FEM for this material was performed to validate the proposed methodology. Finally, a comparison using Larson-Miller model was conducted for Inconel 617 at 700℃.