X-ray micro-tomography (X-μCT) was applied to obtain the complete three-dimensional (3D) recordings of the PBX under unidirectional warm die compaction based on TATB granules. The loose-packed granules obtained through heating up to softening, compaction and friction were still complete and were preserved in different morphological features. The typical form of compacted granules reveals a polygon at radial direction and oblong shape at axial direction in the PBX. There is an obvious angle between axial direction and radial direction. The axial and radial morphology distributions reveal the mechanics response and internal friction mechanism. X-μCT provides a analysis method of non-invasion into heterogeneous material internal and can probe the arrangement of compacted granule material and high density interface layers in PBXs.