In order to improve energy output and impact security of 2，6-bis（picrylamino）-3，5-dinitropyridine（ＰＹＸ）,the micron PYX particle with mean particle diameter of 1.06 μm was prepared with solvent-nonsolvent recrystallization technology. The experiment was carried out with DMF (N,N-di-methylformamide) as solvent and distilled water as nonsolvent. Its particle size and distribution were characterized by Scanning Electron Microscope (SEM) and Laser particle size analysis. The results show that fine PYX ignition point of 5 s delay is decreased by 0.98%,its impact sensitivity is reduced by 152.62% and its steel engraving is increased by 9.94%.