The aim of this work was to optimize the synthesis route for silver nanoparticles by chemical reduction method, the morphology and particle size of nanosilver synthesized in three solvents, namely ethanol, ethylene glycol(EG) and deionized water, were comparatively studied. Firstly, chemical reduction methods were used to prepare nanosilver under PVP protection in ethanol, ethylene glycol and deionized water respectively using silver nitrate as Ag precursor and hydrazine hydrate as reductant, the reaction temperature was kept at 60 ℃ and the reaction system was vigorously stirred with magnetic force. Then UV-Vis spectrophotometer, scanning electron microscope and Malvern laser particle size analyzer were used to characterize the morphology and particle size of silver nanoparticles. All three reaction systems generated spherical nano-silver, and the average particle size was 35 nm in ethanol system, 40 nm in ethylene glycol system and 53 nm in deionized water system respectively, and the width of particle size distribution increased in the order of ethanol, ethylene glycol, and deionized water system. Besides, the morphology of nano-silver generated in deionized water was diverse, including mainly spherical nano-silver and a small amount of anisotropically shaped nano-silver. In conclusion, using ethanol as a solvent helped produce small and uniform spherical nano silver.