In 1999, ADEOS-II is planned to launch. This satellite aims to observe the global changes of environment based on the carbon, water and energy cycle. For this purpose, ADEOS-II will carry several mission equipments. One of them is GLI (GLobal Imager). GLI is the imaging radiometer possible to observe various objects, for example, ocean color, sea surface temperature, vegetation index, cloud distribution, ice on the land and sea. To satisfy these abilities various methods will be applied to GLI. Collecting Optics consists of 2 off-axis parabolic mirrors to avoid the obstruction in the field of view. Interference filter are joined each other to set up many filter in the focal plane. Both faces of scan mirror will be used in terms of extending the integration time of detectors. In this report these methods and mission of GLI will be described.