A series of NTC (Negative temperature coefficient) composite material of (LaMn1-xTixO3)0.67(NiMn2O4)0.33was prepared by solid-state method. The calcined temperature, particle size, ceramics phase structure,morphology, R-T property and electrical stability were characterized by TG/DSC, Laser particle size analyzer,XRD, SEM, resistance-temperature measurement and aging test, respectively. The results show that in the rangeof 1 200 ~1 300 ℃sintered temperature, the electrical resistivity ρ25 ℃of the composite ceramics increasedsignificantly with Ti content increased. The ρ25 ℃are found to be in the range of 4.4~53 179 Ω·cm and the B25/50values are 1 357~3 998 K. The resistance drift rate ΔR/R0 of the composite ceramics after 1 000 h aging test at125 ℃was less than 0.51%. The electrical resistivity and B value of (LaMn1-xTixO3)0.67(NiMn2O4)0.33 could be adjusted to desired values. The composite system has high stability. Therefore, the (LaMn1-xTixO3)0.67(NiMn2O4)0.33could be used for NTC thermistor as advanced semi-conducting materials.