We report a method of carbon nanotube and nano-polyhedron growth in graphite surface by 60keV Ar+ ion beam bombardment. High resolution transmission electron microscopy (HRTEM) reveals that the nanostructures range from ～20nm to ～0.4μm in size and the distance between carbon layers in multilayer walls is 0.34nm. Based on HRTEM images, we propose a growth model of “combined carbon polyhedron”.