This article consists of three parts.In the first part

the aim of theglobal change observations is narated in brief and the development is then depicted

beginning from the earliest meteorological satellite and then the Landsat and someother relevant satellites from different countries.Emphasis is placed on the use ofmicro wave sensors.Finaly some international activities for global change observa-tions are depicted and the Earth Observation System（EOS）project in America isintroduced.In the second part

some happenings and policy changes due to thehuge financial budget for satellite launching in America are narated.In the thirdpart

the contributions and the tasks ahead in China for the research works of globalchange are discussed.