Abstract: Carbon fiber reinforced polymer composites were widely used in civil aircraft structures and subjected to complex environments (hydrothermal, corrosion, complex stress, and electro-thermal effects, etc.) during service. But the impact of low-intensity currents on carbon fiber reinforced polymer composites has attracted less attention. In this paper, the carbon fiber/resin composites were taken as the research object. The interface temperature range of the carbon fiber monofilament/epoxy resin composite specimen was calculated based on thermo sensitivity of carbon fibers and the dynamic of resistance change when an electric current was applied. Raman spectroscopy test and monofilament fracture test were used to study the influence of low-intensity current on the interfacial stress and interfacial shear strength of monofilament composite system. The results of the study show that:with increment of the current intensity, the interface temperature of the monofilament composite system is increasing. When the current is up to 8 mA, the interface temperature is as high as about 200℃.With the increase of the current intensity, the interfacial compressive stress of the monofilament composite system increases first and then reduces. When the current is higher than 7 mA, the resin at the interface undergoes ablation degradation and destruction. Monofilament fracture experiment illustrates that with the increase of the current intensity, the interfacial shear strength of the monofilament composite system increases initially and then decreases. The interfacial shear strength reaches a maximum of 62.39 MPa at 6 mA and the interface shear strength is only 34.95 MPa at 8 mA.