Abstract: The relationship between the composition of various amorphous components in shale reservoirs and their mechanical properties is crucial for enhancing the understanding of shale brittleness and elucidating the factors that influence the fracturing reconstruction of shale reservoirs. The presence of diverse types and varying quantities of amorphous components in shale reservoirs introduces uncertainty in the determination of rock mechanics weight coefficients when employing X-ray diffraction analysis. This uncertainty subsequently impacts the quantitative assessment of shale brittleness. This study focuses on representative shale samples from the DY1H well (eastern Sichuan Basin). X-ray diffraction technology serves as the primary analytical method, supplemented by experimental techniques such as thin section, scanning electron microscopy, and carbon-sulfur analysis. These methods are employed to quantitatively investigate the relationship between the content of different amorphous components and their mechanical properties through an enhanced calculation method for rock mechanics weight coefficients. The results reveal that the shale from the Permian Wujiaping Formation at the DY1H well possesses a significant proportion of amorphous components, with an average total mass fraction of 47.60%, and a notable predominance of inorganic components, averaging 37.04%. Furthermore, the inorganic and organic components within the amorphous fractions demonstrate both positive and negative correlations with rock brittleness, suggesting that the amorphous inorganic components confer brittle characteristics while the organic components exhibit plastic characteristics. Variations in the content of amorphous organic components within shale reservoirs can influence the precision of brittleness index calculations derived from mineral composition methods. Specifically, when organic carbon content is low, the mineral composition method can be effectively utilized to assess shale brittleness. Additionally, the content of amorphous inorganic components in shale shows a positive correlation with the presence of illite-montmorillonite mixed layers within clay minerals, indicating that these interlayer clay minerals are products of the transformation of amorphous inorganic components during diagenesis. In scenarios where a high abundance of amorphous inorganic components is present in shale, it is crucial to consider the role of interlayer clay minerals, which can improve the plasticity of the shale.