In order to analyse the electrostatic hazard of micro-nano energetic materials, the electrostatic accumulation experiments were carried out with industry and nano RDX, HMX explosive using different standard sieve instead of the chute. The electrostatic accumulation of RDX and HMX were obtained by Faraday cylinder, and their electrostatic hazards were analyzed. The influences of explosive powder quantity and particle size on the electrostatic accumulation under condition of the 50 aperture standard sieve were studied. The electrostatic hazards of nano RDX sieved with different aperture standard sieves were compared. Results show that the more the amount of explosive is, the greater the electrostatic accumulationis. There is certain linear relationship between the standard sieve aperture and the electrostatic accumulation. The average mass charge density of nano RDX and HMX with the particle size of 80 nm are -21.1 and -8.1 μC·kg^-1 respectively, and are about 3.6 times of those of industrial RDX and HMX respectively, indicating a high electrostatic hazard. The electrostatic accumulation of RDX is about 2.6 times of those of HMX in the same particle condition.