Abstract: Relying on a road ground project filled with rockfill, the creep behavior of rockfill is studied. Based on the creep model with three parameters (b, c, d), the Shunsuke Takagi multi-linear load mode is introduced to analyze the time-dependent law of deformation of rockfill under step load. The triangular distribution characteristics of self-weight stress of road ground structures are also taken into account. Through the results of indoor large compression tests, the required model parameters are obtained, based on which the creep behavior of road ground rockfill of typical cross section of the supporting project is analyzed. The results indicate that the own compressive creep of road ground structures can be ignored. The conclusion is validated by the small gradation change before and after the compression tests.