Composites of polyaniline (PANI)-coated carbon micro-coils (CMCs) were synthesized by in-situ polymerization and emulsion polymerization methods respectively. The morphology and structure of the composites were characterized by FTIR,SEM and XRD. The results show that after CMCs have been treated with nitric acid (H-CMCs), more carboxyl group appeared on their surface, which is beneficial to the adhesion of PANI to the surface of CMCs. The electrochemical property of the composite was assessed by means of cyclic voltammetry (CV), constant-current charge-discharge and alternating-current impedance measurements. The results proved that the specific capacitance of PANI-coated H-CMCs was obviously higher than that of the H-CMCs themselves, while the in-situ polymerized H-CMCs/PANI-2 had the highest specific capacitance of 109.3 Fg^-1, which was much higher than 35.76 Fg^-1 of the H-CMCs at a scan rate of 5 mVs^-1. The constant-current charge-discharge curves revealed that the composite capacitors contained not only the electronic double-layer capacitance of CMCs but also the faraday pseudo-capacitance of PANI. Electrochemical impedance spectroscopy (EIS) shows that the PANI coated H-CMCs present better conductivity and super capacitor characteristic.