Abstract The conductive Polyaniline (PANI), Polyaniline/graphite nanosheets (PANI/NanoG), Polyaniline/Silver plating graphite nanosheets (PANI/Ag-NanoG) Polyaniline/Nickel plating graphite nanosheets (PANI/Ni-NanoG) composites have been synthesized by chemical oxidation polymerization. Morphology of the composites has been examined by scanning electron microscopy (SEM) and X-ray diffraction techniques (XRD). The results reveal that the kinds of composites had synthesized successfully. Thermal decomposition mechanism and kinetic study were studied and the results showed that it was accorded with one-dimension model for PANI and three-dimension model for PANI/NanoG, PANI/Ag-NanoG and PANI/Ni-NanoG composites.