Due to the continuous increasement of new demand for the energy. nuclear power energy again more and more is taken under serious consideration, and also, in connection with the international interest and efforts in reducing the CO2 emission, its the cleanest energy source concerning to climatic influence has become world wide of special interest again and is somehow world wide under hydrogen gas and electricity. The TRISO coated UO2 particles from the spherical UO2 kernel via UN solution is used for the HTGR unclear fuel. The Sol-Gel process, in here, has been studied with aim of producing the UO2 kernel particles. In this study the spherical UO3 gel particles via UN solution, an intermediate, were prepared by the sol-gel process(including the internal and external gelation processes) with a vibrating system, and then the characteristics of these particles were analyzed by steroscope. FT-IR, TG/DTA, and D-ray.