A bilayer concept was proposed to adjust the electrical properties of NTC thermistors. The conventional NTC material Ni0.75Mn2.25O4 was chosen as the sensitive layer, and high conductive LaMnO3-Ni0.75Mn2.25O4 composite was chosen as the support layer. The bilayer NTC thermistors were successfully fabricated by classical uniaxial pressing method. After cosintering at 1235 degrees C for 4h, the two layers adhered well to each other without any cracking or delamination. The resistance decreased linearly with the decrease in the thickness of Ni0.75Mn2.25O4 layer, and the B values varied between 3868 and 3901K. After annealing at 150 degrees C in air for 500h, the resistance shifts at 25 degrees C were less than 1%, which mean that the bilayer NTC thermistors had high stability.