Application techniques of two functional light aggregates （thermal insulation fine aggregate and thermal storage coarse aggregate） in C55 and C30 mass concrete and their effects on the hydration process of cement were investigated. The influence of functional light aggregate admixture on the fresh concrete properties， mechanical properties， peak temperature， and rate of temperature rise was measured. An application technique under semi-saturated conditions and controled comparable working performance by decreasing water content was proposed. The results indicate that both thermal insulation fine aggregate and thermal storage coarse aggregate have certain early strength and temperature control functions， in which the thermal storage coarse aggregate is better. The thermal insulation fine aggregate has little effect on the setting and hardening rate of concrete， whereas the thermal storage coarse aggregate can play the role of in-situ self-heating curing in the early stage due to its phase change energy storage， which obviously speeds up the setting and hardening rate.