In this study, ferroelectric PMN powders and thin films were fabricated from metal alkoxide- based solution by sol-gel process. PMN thin films were deposited on platinum coated silicon substrate by dip coating method. The properties of PMN gel powders and thin films such as organic decomposition behavior and crystalline phase transformation de pending on heating temperatures were investigated th rough thermal analysis, FT-IR, Raman spectroscopy, and XRD. Also, the effects of addition of excess PbO and MgO to the perovskite crystal phase formation on PMN thin film were investigated The film thickness formed on platinum coated silicon substrate with S coating cycles was about 3000 after heat treated at $820^{circ}C$ for 1min. When the PMN thin film was prepared with 15% excess PbO and heated at $820^{circ}C$ for 1min., the single phase perovskite was obtained. We confirmed the fact that in sol- gel process, the formation of the perovskite phase increased with the addition of excess MgO(10m71%), which is consistent with the result observed in the solid phase reaction. Values of dielectric constants and dielectric loss(tan$delta$) of PMN thin films deposited on platinum coated silicon substrate and heated at $820^{circ}C$ for 1 min. were 2200~2700 and ~0.033 (at 10kHz), respectively