Creep is an important mechanical property of rock, and it is closely associated with the long-term stability of rock landslides. To further discover the sliding mechanism of the horizontal-strata landslides, red sandstone samples were taken from Erchengyan horizontal-strata landslide bedrock in Wanzhou, and triaxial creep tests by step loading technique were conducted on red sandstone with RLM-2000 triaxial rheology test machine. The triaxial creep tests lasted 1180h under the constant temperature of 18.5±0.5. Boltzmann superposition was adopted for test data processing, and an improved translational coordinate method was used to reduce the degree of the data distortion. With the improved method, a complete creep curve of red sandstone strikingly consisted of three stages, namely, attenuated creep stage, steady creep stage and accelerated creep stage. The complete creep curve of red sandstone can be fitted by Burgers model.