Accurately characterizing the embedding behavior of proppants under reservoir stress is critical for optimizing fracturing design and ensuring long-term stable production. Triaxial compression experiments were conducted to simulate typical stress conditions in tight gas reservoirs of the Ordos Basin, investigating the effects of fluid?rock interaction, lithological differences, proppant size, and combination schemes on proppant embedding and crushing. The results show that: (1) Fluid?rock interaction significantly aggravates proppant embedding but reduces the crushing rate; quartz sand responds more sensitively due to energy redistribution mechanisms, and its embedding risk requires priority control. (2) Reducing proppant size decreases embedding depth and crushing rate, but leads to a sharp increase in the embedding ratio; in the fine?size range (70/140 mesh), the size effect outweighs the material effect on crushing. (3) Reservoir lithology governs the embedding?crushing behavior: coal shows the deepest embedding yet the lowest crushing rate, limestone exhibits the highest crushing rate but the shallowest embedding, and sandstone displays intermediate characteristics. (4) A wide?graded combination (20/40+70/140 mesh) reduces embedding depth by 28.2% through coarse?fine synergy, while a continuous?graded combination (40/70+70/140 mesh) forms a gradient?bearing structure, lowering conductivity decay to 77.38%. Accordingly, it is proposed that branch fractures in tight gas reservoirs be filled with multiple high?concentration layers of 70/140?mesh quartz sand, and main fractures employ wide?graded continuous particle?size combinations to enhance conductivity stability.