The technical requirements of electrochemical power sources for hybrid vehicles were described briefly in this paper. The advantages and disadvantages of electrochemical power sources, which included storage batteries, super-capacitors, fuel cells, valve-regulated ultra battery, were also discussed. Based on electrical properties, safety and cost, Ni-MH battery and hybrid super capacitor of C/ KOH SO-lution/NiOOH are reasonable selections for auxiliary power sources of hybrid vehicles.