Two superfine particles of 1, 3, 5-triamino-2, 4, 6-trinitrobenzene (TATB), 2, 2′, 4, 4′, 6, 6′-hexanitrostilbene(HNS) were prepared respectively and their particle conglomeration′s microstructures were studied by SEM method, gas sorption method, and fractal method. Results show that the HNS conglomeration consists of cashew-like nanometer crystals which piles up tightly here or loose somewhere else with surface area of 11.8 m²·g^-1, and the TATB conglomeration consists of nanometer crystals which connect mutually with surface area of 24.77 m²·g^-1. Both samples show Ⅳ type desorption isotherms with hysteresis loop ranged in high relative pressure 0.8-1. Barrett-Joyner-Halenda (BJH) analysis and Horvaih-Kawazoe (HK) analysis indicates that TATB conglomeration has the higher pore volume and higher surface area than HNS conglomeration before 12 Å and after 80 Å, while it is reverse within 12-80Å, which indicate that the microspore contributes to pore volume more than mesopores. In addition, the fractal microstructure are found from the desorption isotherm of both samples. The fractal dimension behaves low in range of relative pressure p/p₀ of 0.00-0.04, medium in 0.04-0.10, and high in 0.1-0.2. TATB conglomeration has higher fractal dimension than HNS in every similar range. BJH data, HK data, and fractal analysis disclose more details of microstructure than surface area and the textual discussion should be expected beneficial to comprehension of microstructure and microstructure -performance relationship.