In the present research field polymerization way for the synthesis of polyaniline (PANI) This research paper paper reported the doping of polyaniline with single walled and multiwall carbon nanotubes by chemical oxidation method in situ polymerization. Here we use HCL as a dopant and APS (ammonium peroxy disulphite) as an oxidizing agent . The MWCNT were ultrasonicated to obtain uniform dispersion within the PANI matrix. The molecular structure is determined by forier transform infrared spectroscopy (FTIR)which show the peaks of pure PANI comparing with its composite .Structural information can be obtained from X –Ray diffraction study (XRD).TGA (Thermogravmetric analysis ) is use to identify the stability of composite at certain temperature .