Abstract: 1. Introduction Recently, the fiber reinforced polymers (FRP) are increasingly used in poles and crossarms with good insulating and mechanical properties. Compared with the traditional concrete poles and steel crossarms, the FRP composites poles and crossarms can not only reduce the structural weight, but also can improve protection level against lightning effectively leading to the decrease of the lightning trip-out rate. While, the aging resistance and service life should be evaluated to ensure the security and stability of operation, especially for the outdoor composite power equipment. Therefore, the aging properties of FRP composites poles and crossarms were investigated in this paper. 2. Experimental Details 2.1 Specimen preparation l Polyurethane (PU) resin sample bars preparation l FRP composites sample bars preparation of manually making, pultrusion process and winding process. 2.2 Test platform The multi-factor accelerated aging chamber can simulate the complex operation environment. The swing of pole body and crossarm is simulated by the low frequency oscillation of the crank connecting rod drived by electric motor at 0.6Hz. The weight of the wire that the insulator bears is supplied by extension spring, 25kg. In addition, the rain, salt fog, high and low temperature, high humidity, UV-irradiation, and high voltage electromagnetic field environment also can be simulated. 2.3 Test method The PU, FRP composite sample bars with different processing technic and FRP composite poles and crossarms were put into the multi-factor accelerated aging chamber for 4000h. The PU, FRP composite bars would be tested flexural modulus at intervals of 500 hours. Besides, the strain of the pole and the crossarm was monitored by fiber bragg grating in real-time. 3. Results and Discussions The results showed that after 4000h multi-factor accelerated aging test, the flexural modulus retention of FRP composite materials were higher than 90%, and that of pultrusion FRP composite materials were up to 95.8%. Besides, the FBG strains of FRP composite poles and cross-arms products were less than 2 ‰ located on the maximum displacement. The hardwares were rusted seriously after 2 weeks without protection, while the surface and internal structure of the composite material were intact. 4. Conclusions l The FRP composites poles and crossarms have good ageing resistance. l The sample of FRP composite materials produced by pultrusion process shows better resistance to aging. l The FRP composite poles and crossarms have good corrosion resistance against the metal ones.