Composite crossarm insulators for power transmission urban network transformation projects, especially the effective use of the narrow corridor area of the city, various tunnels boost power transmission. And can reduce the tower height, save a lot of financial and material resources. These products high bending strength, anti-fouling properties, seismic, impact resistance, anti-brittle performance, small size, light weight, easy to install impact-resistant, maintenance-free manual cleaning, porcelain cross arm is irreplaceable product.