Analysis was made on classes,electrical and mechanical characteristics of available in China porcelain and glass cap and pin insulator as well as composite insulators in accordance with technical requirements of 1 000 kV a.c.transmission line for insulators.1It is pointed out in consideration on service requirement that the key technology for insulator application at UHV system is anti-pollution solution and development and innovation of insulators of high strength classes and large creepage path.1The electric stress distribution along UHV insulator string shall deserve extra attention.1In addition to standards GB/T1001-2000 and GB/T19519,1impact test(for normal type only),visible corona voltage test,RIV test,power frequency arc test,mechanical vibration test and along string mechanical test shall to introduce.
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