Factory 624, later known as the Harbin Jiancheng Group, a subsidiary of Norinco, began the development process in 1974, with prototypes completed in 1980.

The series was renamed at Zhuhai Airshow 2012 as the Tian Ge (Chinese: 天戈; pinyin: tiān gē; lit.

[17] Later variants of the GB series bomb, such as GB25, GB50, GB100 and GB1000, has third- and fourth-generation gimbaled seeker with dual model guidance module, combining laser with satellite / inertial navigation.

[18] At the Zhuhai Airshow 2012, Harbin Jiancheng Group also revealed Tiangang (Chinese: 天罡; pinyin: tiān gāng; lit.

[23] At the Zhuhai Airshow 2012, Harbin Jiancheng Group also revealed Tianlei (Chinese: 天雷; pinyin: tiān léi; lit.

[24] Tianlei series bombs are multi-purpose airborne munitions dispensers with glide wings, which serves as a universal platform with customizable payloads, including various types of submunutions.

[25] The TL500 has a cube-shaped stealth enclosure that reduces radar cross section (RCS) and increasing internal volume for payload, a launch mass of 500 kg (1,100 lb), and a reported range of more than 60 km (37 mi; 32 nmi)[26] or 80 mi (130 km; 70 nmi).

[24] TL500 is the same or very similar to the K/YBS500 multi-purpose airborne munitions dispensers in the People's Liberation Army service, which is also developed by the 624th Factory (Harbin Jiancheng Group) of Norinco.

[27] The TL500 and the Chinese service variants are capable of all-weather operations, autonomous flight, smart target acquisition, and long-range strike.

[25][29] The Tianlei-2 (TL-2) or GB6A[24] variant was showcased at Zhuhai Airshow 2016, which is a GB6 guided bomb fitted with a miniature turbojet engine.

The jet engine makes GB6A a cruise missile, providing extended range and offering capabilities similar to that of Storm Shadow and Taurus KEPD 350.