The nanotribological behavior of C-60 and C-70 films on graphite has been studied. C-60 molecules on graphite begin to grow in a monolayer form, whereas C-70 molecules begin to grow in a bilayer form. The shear stress between a C-60 monolayer and graphite was estimated to be about 0.2 GPa. For C-60(111) films, a change of tip motion, from one-dimensional stick-slip to two-dimensional zigzag stick-slip with decrease of a loading force, appears.