The aim of this study is to investigate the crystallization of superfine ammonium perchlorate (AP) particles using some advanced liquid antisolvent crystallization (LASC) methods containing liquid antisolvent equipped with Y-jet mixer (LASY) and evaporation antisolvent crystallization (EASC) methods. Scanning electron microscopy (SEM), optical microscopy and X-ray diffraction techniques were used to investigate the crystal-size distribution (CSD), average particle size (APS), sphericity, uniformity coefficient (UC), and crystallinity of prepared samples. Also, microstructure image processing (MIP) technique in combination with MATLAB and the Rosin-Rammler (RR) equation were used to analyze specifications of the prepared particles. The results of MIP analysis technique were illustrated that the particles obtained with the LASY method represented higher sphericity (0.89-0.92) than EASC method (0.79-0.82). Also according to the Rosin-Rammler analysis results, the highest uniformity coefficient was related to the LASY method (3.83-4.02). The results of this study were shown that the LASY method can be considered as a safe and simple procedure for rapid preparation of superfine ammonium perchlorate particles with regular morphology.