Crushing Multi-Walled Carbon Nanotubes (MWCNTs) by cryogenic crusher is one of mechanical methods to create good dispersion Carbon Nanotube (CNT) as structural modification of MWCNT for potential hybrids materials. Crushing in 15 and 30 minutes effectively cut tubes to be shorter and densely-packed structure formed after crushing 30 minutes. Based on Raman spectroscopy and thermal behavior of crushed MWCNTs, functionalization of MWCNT unidentified after crushing. Burn temperature of crushed MWCNTs (601.6 °C and 603.6 °C) appeared to be sooner than that's of pristine MWCNT (642.2 °C). The low oxidation resistance of crushed MWCNT pointed out presence of defective carbon corresponding to too short-CNT due to cutting.