Abstract:From 1983 to 1985, authors had made the field plot cxperiments on rice (Oryza sativa L.) in Yuanjiang (dry-heat river valley about 400 m altitude), Dali (warm-cool plateau lake-shore about 2000 m altitudc) and Lijiang (cold--cool plateau area about 2400 m altitude), Yunnan, respectively, and have measured in situ daily changes in photosynthetic rate, its responses to quantum flux density, CO2 compensation points and photorespiration rates of rice grown at the above three localities.