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Nano-SiO 2 (NS), due to its prominent nucleation and pozzolanic effects, holds the promise to effectively enhance the tensile and compressive properties of highstrength strain-hardening cementitious composite (HS-SHCC) at both early age (1d, 3d) and normal curing age (28d). The influence of nano-SiO 2 (NS) on the hydration, microstructure and mechanical properties of HS-SHCC with different dosages (i.e., 0%, 1%, 2%, and 3% by mass of cement) were explored in this research. The nucleation effect of NS particles accelerated the hydration process, Ultra-high performance concrete (UHPC) with extremely low water-to-binder ratio has attracted increasing attention because of its high compressive strength and excellent durability. 1 Nonetheless, it is still challenging for UHPC to Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.