Abstract: In a lot of singleshot applications and experiments at remote locations where magnetocumulative generator provide the most practical pulse power, it is impracticable to use a capacitor bank as the initial energy source. Ｖ．Ｖ．Gdovnina et al has used a permanent magnet ring as the initial energy source to drive a magnetocumulative generator, but the energy density stored in a single permanent magnet ring is very low. In this paper，the possibility of using periodic structure permanent magnetic rings as initial energy source of magnetocumulative generator is analyzed theoretically. It is concluded that 1kJ initial energy can be provided to magnetocumulative generator by the periodic structure permanent magnetic ring whose mass is less than 30kg and the outside radius less than 60