The pressurized spray system with nitrogen gas was designed to fabricate the spherical AN(ammonium nitrate) particles. When AN melt was sprayed from a nozzle with equivalent diameter of 0.28mm into an ambient dry air, the ligament breakup mechanism of the molten AN was found to be responsible for the droplet formation(or disintegration) of AN melt. In the experimental range of spray temperature with $170{sim}200^{circ}C$ and atomization pressure with $0.1{sim}0.4MPa$, the spherical AN particles with mean diameter of $130{sim}250{mu}m$ were obtained.