We studied the dependence of electrical conduction mechanism of Cupric Oxide on temperature and measured the specific resistivity of sintered specimen from $600^{circ}C$ to 90$0^{circ}C$ . We considered the relations between electrical conducti-vityand temperature with reheating the sintered specimen. X-Ray diffraction patterns showed that lattice parameters of cupric oxide increased above 20$0^{circ}C$. Cupric oxide had nostoichiometric compositions$(CuO_{1+x})$ owing to the excess oxygen and showed hole conduction with energy gap of 0.15eV below $650^{circ}C$$pm$1$0^{circ}C$ Above $650^{circ}C$$pm$1$0^{circ}C$ cupic oxide had the stoichiometric composition and showed electron-hole conduction owing to the intrinsic ionization with energy gap of 1.04V.