Ceramics have unique properties such as high thermal resistance, high toughness, resistance against corrosive materials and acids, high endurance and good catalytic activity. These properties of ceramics has attracted many researchers in different fields of science worldwide. Ceramics are used in medical fields, filtration, composite materials, bulletproof clothes etc. Basically, decreasing the size of particles to sub- micrometer range, especially nanometer, effectively changes the properties of materials and ceramics are no exception. Cerium oxide is a ceramic known as ceria or cerium de-oxide. Thanks to their properties, serium oxide nanoparticles due are used in a variety of fields such as oxygen detection sensors or as a catalyst. In the past, cerium oxide nanoparticles were produced through sonochemical and hydrothermal but electrospray has advantages like smaller particles and more uniformity. In this research effective parameters such as polyvinyl alcohol concentration in cerium nitrate solution, applied voltage, distance between nozzle and collector and solution feed rate on cerium oxide nanoparticles’ size, are considered. The distance between nozzle and collector was 10 and 23 centimeters, the applied voltage in this research was 10, 15 and 20 kilo volt and the chosen feed rate was 0.125 and 0.25 ml/h. Concentration of PVA has been varied between 3-9 (w/v%) in distilled water as the matrix for 25(w/v%) cerium-nitrate solution in distilled water (7.5 – 1). The results of this research have shown that producing cerium-oxide nanoparticle was only possible in the range of 5 – 8% cesium oxide in polyvinyl alcohol solution. With other conditions constant, increasing the cerium oxide concentration increases the mean nanoparticle size from 82 to 109 nm. It was also found that found that decreasing the feed rate , increasing nozzle collector distance , as well as increasing the apply voltage , decreased the min size of electorsprayed ceramic nanoparticle. Increasing the voltage from 10 to 20 kV, decrease the average nano ceramic particle from 105nm to about 73nm. Decreasing the feed rate from 0.25 to 0.125 mL/h, decreased the average size of the electorsparyed nano ceramic from 94nm to 82nm. The gross average of all the electrosprayed cerium oxide nanoparticle in the range considerd in this research was about 81nm.