Abstract: The composite of polypyrrole (PPy) and polyaniline(PANi) was successfully sythesized by in situ sequence feeding chemical polymerization. The composite was characterized by scanning electron microscopy, filtergrating infrared spectrometer for structure, and electrochemical station for supercapacitive performance. Results show that the composite of polypyrrole and polyaniline have hierarchy structure; the cyclic voltammetry curves of the composite approach the rectangularlike； the typical constant discharge responses are found； the excellent supercapacitive performance present electric double-layer capacitance. The maximum specific capacitance of PANi-PPy and PPy-PANi reaches 227.6 and 195.5 F/g, respectively.