Abstract: Conductivity and infrared absorption of La_1-xSr_xMnO₃ conductive ceramics were investigated. Results show that the resistivity decreases with increasing x, undergoes a minimum at x=0.5, and then increases with further increases of x. The conductive ceramics with the largest infrared absorption peak correspond to the smallest resistivity. And the conductive mechanism of La_1-xSr_xMnO₃ conductive ceramics is analyzed.