CMA has long embarked on preparation for Fengyun 4 (FY-4) - its next generation of geostationary meteorological sate llite, a three-axis stabilized platform that shall provide for CMA with enhanced space-based observations in future. Launch of the first flying model is scheduled for 2014 and to serve for the experiment and demonstration of the system. Based on user requirement and technical feasibility, FY-4 mission is outlined as follows.

● To take multiple spectral band measur ements of high temporal resolution and accuracy, to obtain imagery of the earth's surface and cloud, including the segment images; overall increase the capability of CMA in space-based quantitative observation and application.
● To measure the vertical profile of temperature and humidity of the atmosphere with improved detection accuracy and vertical resolution.
● To detect the lightning to obtain t he map that positions the lightning occurrences.
● To broadcast the observational im ages, data and derived products with onboard transmitter.
● To collect the earth environmental measurements from automatic data collection platforms and transmit to users.
● To monitor solar activities and space environment to provide the data for space weather research and service.

The instrument should be dev eloped to satisfy user requirement for FY-4 missions in imagery, sounding, lightning ma pping, and space environment monitoring. The following payloads are considered to fulfil the missions.

FY-4 use of frequencies shall respect to the need for the increased amount of data in transmission, DCPS, TARS, Tele metry and command. FY-4 provides 1675- 1687MHz HRIT data transmission, 1696 - 1698MHz LRIT data transmission and WAIB( Weather Alarm Info rmation Broadcast).