AVIC I was mainly focused on large planes, while AVIC II was mainly focused on smaller planes, such as trainers (JL-8, utility aircraft (licensed version of Cessna 208 Caravan), L-15, and CJ-6), small passenger airliners (Harbin Y-12), medium range transport aircraft (Y-8), and helicopters (Z-8, Z-9, WZ-10 and Z-11).
AVIC I was historically focused on large planes such as bombers (Xian H-6, Xian JH-7), medium commercial planes (ARJ21), or fighter planes (J-7, J-8, J-10, J-11, and JF-17), while AVIC II was focused on smaller planes and helicopters.