Abstract: Alginate mangane microspheres were prepared by dipping the alginate solution in the manganese chloride solution，and then used to adsorb the pyrrole monomer. Using acidic potassium permanganate solution as oxidation agent，the pyrrole monomer was polymerized to form the polypyrrole（PPy）on the surface of the alginate manganese spheres to form the composites microspheres of PPy/alginate manganese. The structure，morphology and electrochemical properties of the compositespheres were characterizated by the infrared spectroscopy，SEM and electrochemical workstation.The results showed that there was PPy microspheres with 200 to 500 nm diameter on the surface of the composites spheres of alginate manganese. As increasing the solidification time，PPy/alginate manganese alginate composite spheres had a tighter structure with a lower polypyrrole amount， its ca? pacitance decreased. Such spheres with the biocompatible and conduct properties will be widely ap? plied in the novel electrode field.

Key words: alginate sodium, polypyrrole （PPy ）, alginate manganese, nanospheres, electrode material