The CZ-4B introduced in 1999 was an improved model of the CZ-4B with an enhanced third stage and fairing. It measured 44.1 metres in length with a first stage thrust of 300 tonnes.
Launches: 3. Failures: 0. Success Rate: 100.00% pct. First Launch Date: 10 May 1999. Last Launch Date: 01 September 2000. Payload: 2,800 kg. to a: Sun synchronous, 900 km orbital trajectory. Liftoff Thrust: 302,000 kgf. Total Mass: 249,200 kg. Core Diameter: 3.4 m. Total Length: 45.8 m. Launch Price $: 35.00 million. in 1999 price dollars.
Research satellite carried as a secondary payload to study the radiation belts.
Weather satellite. First launch of stretched CZ-4B booster.
INPE experimental scientific satellite with a magnetometer, particle detectors and an atmospheric experiment. INPE reportedly lost contact with the satellite in mid-October.
China-Brazil Earth Resources Satellite.
The Zi Yuan 2 remote sensing satellite was placed into a 474 x 493 km x 97.4 deg orbit. It may use the CBERS Sino-Brazilian bus of the earlier ZY-1.