We focus on the research and development of 35-1 000 kV porcelain-coated gapless metal oxide arresters; 6-800 kV composite-coated gapless metal oxide arresters; 66-1000 kV GIS gapless metal oxide arresters; 35-750 kV line-type composite-coated series-gap metal oxide arresters; complete sets of arresters for ±50-±1100 kV DC transmission projects; gapless metal oxide arresters for railway electrification; and counters and monitors for arresters.