Abstract:Compressive creep test is an important means of understanding creep deformation properties of soft rock and is also an important basis of establishing compressive creep constitutive model of soft rock. The process,method and achievements of compressive creep test for large-scale rigid bearing plate of diabasic dike at Dagangshan Hydropower Station are introduced in detail. The changing laws of compressive creep deformation with time under different pressures are analyzed. Compressive creep empirical equations for diabasic dike at dam site have been established by regression fitting method,which provides important experimental and theoretical references to understand the creep characteristics of diabasic dike at dam site of Dagangshan Hydropower Station.