The rare earth complex oxides with different types have been synthesized. Their structures and electric properties have been investigated. According to our experimental results, the effects of the outest shell electronic configuration, electron spin state, electron transport path and formation of cluster on the electric properties of rare earth complex oxides have been summarized. When the electrons in the outest shell of the central metallic ion are unpair, and the outest shell is not half-filled, the electric conductibilities of these compounds are better. If there is a -M-X-M-X-or-M-M-M-(the distances between two atoms<0.31nm) continuous electron transport path, and the electric configurations of the central metallic ion conform t o the above condition, then the electric conductibilities are good. The isolate cluster can not become the continuous electron transport path, therefore, the formation of the isolate cluster will reduce the conductibility.

Key words: VANADIUM OXIDE, TITANIUM OXIDE, ZIRCONIUM OXIDE, NEODYMIUM OXIDE, YTTRIUM OXIDE, ELECTRONIC STRUCTURE, PALLADIUM OXIDE, LANTHANUM OXIDE, DOUBLE OXIDE, MOLYBDENUM OXIDE