PTC polymer composites were widely used as self-limiting heating cables, current protected devices and sensors. In which, self-limiting heating cable played an important part in petroleum, chemical, medical, electronics for the temperature self-controlled, energy saving, low raw material cost and high security. However, some problems could not be ignored, such as the poor dispersion of CB, low stability of PTC effect and high start current which limited its further applications. Based on practical application, The effect of technology on the performance of the PTC polymer composites was studied beginning with dispersibility of CB in polyethylene.Based on statistical analysis of surface resistance, mechanical properties testing, analysis of micro-morphology and PTC effect testing. The dispersibility of CB, mechanical properties, micro-morphology and PTC effect of the composites filled with four kinds of CB that made in Yuanping, Beijng, Jiaozuo, Nanping were studied. The results showed that Jiaozuo CB had the best dispersibility and the Beijing CB had the highest PTC performance.The self-made pyrophsphate titanate, rare earth titanium, KH102, KH201, KH105, KH550 and stearic acid were used to treat CB, the surface resistance, mechanical properties, micro-morphology, rheological property and PTC effect of the samples were studied. The results showed that the comprehensive properties of the composites were improved by the coupling treatment, self-made pyrophsphate titanate had remarkable effect on improving mechanical properties and CB dispersibility, the rare earth titanate reduced the composite torque and enhanced the PTC intensity.The temperature, time, speed of the internal mixing technology were studied by uniform design and the optimizing technology was obtained by regression analysis, which was 30rpm,13.257min,175℃The starting current of PTC polymer composites was studied. The results showed that the starting current was decreased after coupling treatment, radiation crosslinking had an remarkable effect on decreasing the starting current of composites especially treated by rare earth titanate.