To make clear the compressive Theological property of fiber assemblies, we investigated the compressive creep behaviour of cotton fiber asssemblies, and the following conclusions were obtained: (1) The compressive creep strain of cotton fiber assemblies increases with load, while it reaches the maximum at 30-40°C. (2) The compressive creep strain et of cotton fiber assemblies agrees with that of the Eyring's non-linear three element model, and is given as follows; ec=Yo ln(vt+l) where t is time, Yo and v are experimental constants.