We have performed classical molecular dynamics simulations for hypothetical silicon nanotubes using the Tersoff potential. Our investigation presented a systematic study about the thermal behavior of hypothetical silicon nanotubes and showed the difficulty in Producing silicon nanotubes or graphitelike sheets. Through the investigations on the structure and properties of a double-wall silicon nanotube, we concluded that quasi-one dimensional structures consisting of silicon atoms become nanowires or multi wall nanotubes rather than single wall nanotubes in order to minimize the number of $sp^2$ bonds.