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Si nanoparticle (NP), as one of the most promising functional materials has attracted much attention in next-generation optoelectronic device, photovoltaic and in-vivo/in-vitro bio-imaging technologies, based on its tunable band structure induced optical properties. Due to the quantum confinement effect and large surface to core atom numbers, controlling of size and selective surface passivation during synthesis process, become the most important issue for designing of chemical and physical properties of Si NP. This paper reviews the synthesis method of Si NP with respect to size-controlling and surface functionalization as well as its photoluminescence properties.