The impact of iron phase solid solutions with different aluminum-to-iron ratios on the hydration performance of tricalcium silicate （C₃S） was investigated. The results show that iron phase solid solutions inhibit the hydration of C₃S， and the lower the aluminum-to-iron ratio in the iron phase solid solution， the more significant the inhibition on C₃S hydration. Using testing methods such as isothermal calorimetry and inductively coupled plasma optical emission spectrometer（ICP-OES）， it is found that iron phase solid solutions produce metaferrate and metaluminate ions after hydration. The metaferrate ions hinder the precipitation of calcium hydroxide， thereby inhibiting the hydration of C₃S， while the metaluminate ions can mitigate the inhibitory effect of the metaferrate ions on C₃S hydration.