Earth observation technologies can be widely used in such domains as territorial planning and management, urban
development, precision agriculture, intelligent transportation. As a member of the Inter-governmental Earth Observation
Consultative Organization, China's earth observation system is an indispensable component of globe earth observation
systems. The development of China's earth observation satellites can contribute to globe earth observation system. The
general situation and performance parameters of China's main running satellites for earth observation like
meteorological satellites, resource satellites, marine satellites, environment and disaster reduction satellites, and
Beijing-1 small satellite are illustrated. The applications of China's earth observation satellites are analyzed according to
various domains such as nature disaster early warning and monitoring, marine monitoring, geographic surveying. The
construction of China's earth observation system is a key element of globe spatial information technology infrastructure.
Its development and improvement certainly strengthen science and technology support level of human observing ability
and earth system science enormously. It provides the important technology support to global environmental change
research, specially the influence of humanities factor to global change.