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 guidance system is unstabilized in roll, relying on bang–bang control like the Pavewave II, and the cruciform tail assembly provides maneuverability.
Weighing 564 kg (1,243 lb) and ranging 24 km (13 nmi), the warhead can penetrate 1.5 meters thick reinforced concrete.
The mounting bracket[14] and tail structure of the LT-3 is derived from the LS-6 250kg version, though the two bombs have different guidance methods and masses.
[16] The LT-3 uses a wide field-of-view (FOV) laser beam-riding gimbal, similar to Paveway III.
One of the earliest types was called Blue Sky (Chinese: 蓝天; pinyin: Lán tiān), and was publicly revealed in the late 1990s.