Abstract: For the first time,polyaniline /activity mesophase carbon microbeads composite was synthesized by in-situ chemical polymerization which used ammonium persulfate（APS） as oxidant,the middle-phase activated carbon microspheres and aniline（ANI） as the main raw material.The microstructure and component of the obtained materials were characterized by scanning electron microscope（SEM） and X-ray diffraction（XRD）.With the aim to investigate the electrochemical performances of the composite,Hybrid capacitor was fabricated,and cyclic voltammetry,ac impedance spectroscopy,galvanostatic charge-discharge tests were done.The results show that in 1M O₃SO₄ aqueous solution as electrolyte,specific capacitance of composite materials increases to 288.46F/g.