The influence of heat curing was considered which it has on the hydration and silicate structure of cement paste (CP) and silica fume paste (SFP).The influences were discussed from the perspectives of cement hydration required by the Rietveld method using powder X-ray diffraction (XRD), silica fume hydration by the selective dissolution method and silicate-chain polymerization of calcium silicate hydrate (C-S-H) by the trimethylsilyl (TMS) derivatization method.We investigated the effect of the cement and SF hydration reactions and the C-S-H silicate structure in fresh SFP and heat-cured SFP.Our results can be summarized as follows.For the CP hydration reaction, the hydration reaction stagnated and the amount of C-A-H produced increased for the curing pattern with an ultra-low W/B ratio of 15%, a maximum temperature of 90 ℃, and a pre-curing time of 4 hours.