The glassfiber cop osite mat erials product(FRP) crossarm developed by our company,had applied the national patent(Patent NO.03212387.6).This product has save energy,light wei ght,high strength,and good quality on impact,dielectric,corrosion ratardancy,heat retardancy and so on properties. Those good properties are excelled wooden and iron crossarms,Power-frequency withstand voltage,leakage current,bending load etc.indexes are satisfied the following technique conditions.JB/T9676-1999 high-voltage line porcelain crossarm insulator,GB13398insulated pole used under electric con-dition,and GB/T775.3/1987 insulator test method.