The PTCR(positive temperature coefficient of resistance) nanosized ceramic pow der was prepared by Sol-Gel process and characterized by XRD, DSC, SEM and BET techniques. The results showed that the nanopowder has an average crystallite si ze of 35nm with sphere-shaped, whose specific surface area is 27.80m2·g-1 and the crystal structure is abnormal cubical perovskite phase at room temperature. In addition, the nanopowder was pressed into pellets and then sintered accordin g to improved technique which was built based on the data of thermal analysis of the PTCR green-compact to yield PTCR ceramic materials with peculiar microstru cture and higher properties, which has a resistivity at room temperature of ～20 Ω·cm, a temperature coefficient of resistivity of ～19%·℃-1, a withstand v oltage intensity of >160V·mm-1 and a resistivity jump of >105.
