In this paper the grand canonical ensemble Monte Carlo calculations over a wide range of pore-size ration are carried out to evaluate equilibrium partition coefficients, solvation forces, and radial density profiles for model fluids distributing between an external bulk phase and a cylindrical pore phase with molecu-lar dimension. the simulation results obtained from hard-sphere fluids confined within the cylindrical hard-wall pore are used to assess the applicabilities of various theoretical approximations including the virial expansion equation and the extended one-dimensional hard-rod prediction. In addition, Lennard-Jones fluids inside the structureless soft-wall pores are also computed to investigate the influence of adsorption force field on the thermodynamic and structural properties.