We investigate the transport properties of various C-60@(10,10) systems by varying the distribution of C(60)s in the nanotube, based on the Green function approach within the realistic tight-binding model taking account of carbon 2s and 2p atomic orbitals. The periodic peapod systems exhibit quantized transmission corresponding to their band structure. The system with no interaction between the two central C(60)s has only the contribution arising through the nanotube. The transport properties Of C-60@(10,10) are found to significantly depend on the density Of C60S in the nanotube. We discuss the transport properties of the system encapsulating a C-120-molecule. (C) 2004 Elsevier B.V. All rights reserved.