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.

• Shi Jian 5 Spacecraft: SJ-5.

  Research satellite carried as a secondary payload to study the radiation belts.

• Feng Yun 1C Spacecraft: Fengyun.

  Weather satellite. First launch of stretched CZ-4B booster.

• SACI 1 Spacecraft: SACI.

  INPE experimental scientific satellite with a magnetometer, particle detectors and an atmospheric experiment. INPE reportedly lost contact with the satellite in mid-October.

• Zi Yuan 1 Spacecraft: CBERS.

  China-Brazil Earth Resources Satellite.

• ZY-2 Spacecraft: CBERS.

  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.

• 285 - China Academy of Launch Vehicle Technology, As of Nov 1998. HTML when accessed: http://www.calt.com.cn/