Carbon nanotubes (CNTs) functionalized with various surface functional groups were introduced into the fabrication of binder for metal injection moulding. Scanning Electron Microscopy (SEM) micrographs indicated that the functionalized carbon nanotubes were homogeneously dispersed in binder matrix. The polarized optical microscopic photographs and thermal analysis results have shown that the addition of CNTs can not only effectively improve the crystallinity and thermal stability of the binder, but may also increase the green strength of injection sample. The non-covalent bond between carbon nanotubes and polyethylene contributed to the uniform dispersion of the carbon nanotubes and the debinder of the composite.