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Magnetite nanoparticles were synthesized at a wide range of NaCl solutions (c=0.01–3.0M). The particle diameter (d) was reduced from 7.7 to 6.8nm and the colloidal stability dropped with increasing c. The salt effect on the d was successfully elucidated with an aid of a homogeneous nucleation model. The saturation magnetization (M_s) reduction and the lattice contraction (Δa) from −0.015 to −0.038Å with increasing c were observed due to the decrease of the d. From the Δa, the surface tension (γ) enhancement from 0.192 to 0.614N/m with increasing c was estimated.