The present work is aimed to analyze the creep characteristics on Rene" 80. To analyze creep characteristics of Rene" 80, creep tests are performed. To obtain an optimum value of four theta parameters in non-linear square method, a number of computing processes in the non-linear square method were carried out to obtain full creep curves. Creep test results are fitted using theta projection model. Results using theta model has more than 0.95 value if R-square. The theta projection method can be utilized for a design purpose to predict the creep behavior.