||In this study, the carbon black was added into high density polyethylene (HDPE) to produce polymeric positive temperature coefficient (PPTC) component. The effect of carbon black content, plasma treatment of PE, cross-linking agent concentration and γ-ray irradiation doses on the PTC intensity of component were investigated. Used the polyolefin polymer material for the matrix and added the conductive nano-carbon black content, arc-controlling agent (such as inorganic flame retardant). And then, continue various kind properties of composites; such as electricity, physical, mechanical properties were tested. The HDPE was pretreated by plasma and then blended with different content of carbon black, equal ratio of the arc-controlling agent (Aluminum hydroxide, Al(OH)3 and Magnesium hydroxide, Mg(OH)2) and equal ratio of dicumyl peroxide (DCP). After compound, the composites were irradiated by different doses of 60Co γ-ray. Arc-controlling agent possessed the flame retardant ability. On the other hand, adding of dicumyl peroxide (DCP) and irradiating by 60Co γ-ray were increased the PTC intensity of composites. Therefore, these methods could be used to produce PPTC component with over voltage withstanding property. In the research, as HDPE was treated by low power plasma and 2.0phr of DCP was added, the PHDPE/ATH/CB (33.7wt%) composites possessed good over voltage withstanding characteristic and possessed 6~7 order of PTC after γ-ray irradiated (40Mrad). The double PTC phenomenon of composites was observed as the irradiation dose was above 40Mrad. For PHDPE/CB/MH composites, the composites also possessed good over voltage withstanding characteristic with adding 2.0phr of DCP and high doses γ-ray irradiation. These two system composites possessed good reproducibility basically from the 10 times cycles. On the other hand, from the fracture SEM morphology observations and the thermal mechanical properties of HDPE/arc-controlling agent/CB composite were also studied. It was found that the response temperature of thermal mechanical analysis (TMA) was very matched with the PTC responsive temperature. The composites that possessed good over voltage withstanding and good PTC behavior and low-impedance.