To improve the electrical properties of CaMnO₃ powders, the modified Ca1-xPr_xMnO₃(0≤x≤0.3) powders were prepared by the sol-gel auto-combustion route at different calcination temperatures and the effects of calcination temperature on the structure and electrical conductivity of the powders were characterized. It was indicated that the resistivity of modified powders represented the typical V type variation of firstly decreased and then increased with the increasing of calcination temperatures, and the resistivity was the lowest when the calcination temperature was at 1 000 ℃. The XRD analysis illustrated that with the increasing of calcination temperatures, the diffraction peaks of Ca1-xPr_xMnO₃ powders were moved to the small angles with the strengthening in intensity. The crystallography data calculated from XRD illustrated that the cell parameters which related to the resistivity of Ca1-xPr_xMnO₃ powders were affected by the calcination temperatures. When the calcination temperature was at 1 000 ℃, the crystal distortion was most distinct. The SEM analysis illustrated that the higher calcination temperature led to the larger size of grains, and the suitable grain size was good at decreasing the resistivity of Ca1-xPr_xMnO₃ powders. Moreover, the quantivalency of Mn was the lowest when the Ca1-xPr_xMnO₃ powders were calcined at 1 000 ℃. The grain boundary, grain size and the quantivalency of Mn together lead to the decreasing then increasing type variation of the resistivity of Ca1-xPr_xMnO₃ powders calcined at different temperatures.