The development of the Dong Fang Hong-3（东方红三号） started in 1986 and the first Dong Fang Hong-3 satellite was completed in 1994.
It was sent into quasi-synchronous orbit, but did not enter into preset orbit because of the leakage of propellants.
After failure analysis and modification, the second Dong Fang Hong-3 was launched on May 12, 1997 and positioned at 125'E on May 20, providing telephone, data transmission, fax, VSAT network and TV services. Up to now, the satellite has operated for more than four years.
The main body of the satellite is a box-form structure. The satellite has large deployable solar wings and communications antenna with 2m in diameter, which are folded when the satellite is launched and deploy when the satellite enters orbit. The wing span can reach 18.1m and their height is 5.7m. The satellite has 2,260kg liftoff mass and 8-year-designed lifetime.
The Dong Fang Hong-3 satellite is composed of the propulsion bay, service bay, communications bay, communications antenna and solar wings. It has 7 subsystems, including control, power supply, measurement and control, propulsion, structure and communications, etc. The first 6 subsystems make up the satellite platform and the last one is the payload of the satellite.
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