This study investigated on sizes and structures of water-in-oil microemulsions composed of AOT/cyclohexane/aqueous solutions by small-angle neutron scattering method. From SANS spectra it is observed that spherical form whose size is 4-10 nm and cylindrical form whose length is 25-30 nm are formed at four different microemulsion regions. The silver nanoparticles (sherical and rod-like) are prepared at ME4 and ME10 which ratios of three components are 7.35/91.81/0.84 and 37.63/57.20/5.17, respectively.