Abstract: Density serves as a key parameter affecting the mechanical and detonation properties of polymer-bonded explosive (PBX) materials, with quantitative characterization helping reveal relationships between microstructure and macroscopic performance. Therefore, multiple statistical parameters from CT images were extracted to quantitatively analyze the influence of pressure and particle size on PBX density evolution. First, 18 PBX samples with varying pressures and particle sizes were prepared, with CT image grayscale values statistically analyzed and grayscale histograms plotted. Then, grayscale mean, standard deviation, symmetry index, and kurtosis were extracted to quantify PBX density statistical characteristics. Finally, grayscale mean distribution plots along directions parallel and perpendicular to compaction were created, introducing non-uniformity indicators to quantitatively describe PBX density spatial distribution. Results showed that as pressure increased from 50 MPa to 150 MPa, PBX grayscale mean, symmetry index, and kurtosis increased, while grayscale standard deviation and non-uniformity indicators decreased. PBX density distribution was non-uniform, with higher density near mold walls and compaction ends, more uniform distribution along the compaction direction, and larger particle size samples exhibiting smaller, more uniform density distributions compared to smaller particle size samples.