To evaluate the impact of acidic amendments on the active aluminum forms in red soil and aluminum absorption by sweet corn，a pot experiment was conducted with four treatments:blank control(CK)，single chemical fertilizer(F)，chemical fertilizer combined with organic fertilizer( OMF)，and chemical fertilizer combined with oyster shell powder( OSF).The results showed as the following:(1)The application of amendments significantly reduced the aluminum content in both aerial and root parts of sweet corn plants，with reductions of 15.54%-39.61% and 24.48%-36.72%，respectively；Concurrently，plant dry biomass increased by 28.97%-35.24% in the aerial part and 66.52%-83.26% in the root part.(2)The amendments significantly decreased the levels of exchangeable aluminum，organically bound aluminum，and humic-bound aluminum in red soil，especially exchangeable aluminum，with a decrease of 88.55%-97.84%.(3)Soil pH increased by 25.61%-40.76%，while the exchangeable acidity decreased by 77.47%-95.07%，with all differences being statistically significant；(4)The soil bacterial community structure changed significantly，with Chao1，ACE and Shannon indices increasing by 16.85%-33.30%，16.75%-33.53% and 5.38%-8.45%，respectively. Furthermore，the abundance of Sphingomonas and Gemmatimonas increased. In conclusion，the application of organic fertilizer or oyster shell powder in highly acidic red soil effectively mitigated aluminum toxicity and reduced aluminum absorption by sweet corn plants. Among these treatments，organic fertilizer was more effective in enhancing soil bacterial diversity，while oyster shell powder was more beneficial for alleviating soil acidification.