The broth solution was prepared by the mixing of an uranyl nitrate, THFA, PVA, and water. The uranium concentration of the broth solution was $0.5{sim}0.8$ mole-U/L and the viscosity of it was $30{sim}80cSt$. The droplets of this broth solution were farmed in air and ammonia by the vibrating nozzle with the frequency of 100 Hz at the amplitude of $100{sim}130V$. The diameter of the droplet was about $1900{mu}m$ from using the nozzle diameter of 1 mm. The diameter of the aged gel was about $1400{mu}m$ after aging in ammonia solution at $60{sim}80^{circ}C$, and the dried gel with the diameter of about $900{mu}m$ was obtained after drying at room temperature or partially vacuum condition. The diameter of the calcined $UO_3$ microsphere after calcination at $600^{circ}C$ appeared about $800{mu}m$ in air atmosphere. Although the droplets of the same sizes were formed, the calcined microspheres of different sizes were manufactured in the case of the broth solutions of the different uranium concentration. The droplets of the desired diameters were obtained by the change of the nozzle diameters and the broth flow rates.