This study examined the influences of crushing on the microporous and ultramicroporous structures of coal by low-pressure CO2 adsorption (LPGA-CO2). Many replicate experiments were carried out by adjusting the equilibrium time interval to avoid the influence of disequilibrium adsorption on the test results. The results indicated that using the same equilibrium interval is unsuitable for adsorbents with a slower adsorption rate when comparing the adsorption characteristics of samples with different adsorption kinetics (adsorbent, temperature, particle size, etc.). Additionally, coal samples (>0.3 mm) are not suitable for the LPGA-CO2 method as a result of the difficulty in obtaining equilibrium adsorption isotherms. Five commonly used data analysis methods were compared in this paper, and the density functional theory (DFT) and Horvath-Kawazoe (H-K) method were selected to analyze the changes in the microporous and ultramicroporous structures during the crushing process. With regard to the samples from the Haishiwan colliery, when the particle size of the coal samples decreased from 0.18-0.3 to <0.025 mm, the specific surface area (SSA) of the micropores increased from 96.15 to 117.95 m(2)/g (an increase of 19.5%), a finding likely attributed to the opening of the previously closed pores (<0.6 nm). With regard to the samples from the Wolonghu colliery, the SSA of the micropores increased from 195.72 to 224.15 m(2)/g (an increase of 14.5%) and then decreased to 205.49 m(2)/g (a decrease of 8.3%). During the crushing process, the microporous structure of anthracite grows continuously as a result of the opening of previously closed pores (>0.9 nm) before being broken to 0.1 mm; the microporous structure (>0.9 nm) begins to be destroyed when the sample is broken down 0.1-0.045 mm. Finally, the microporous structure (>0.6 nm) is severely damaged as the sample is broken down to a size of 0.045 mm.