介绍了基于强光一号实验平台的2 MV级激光触发开关（LTGS）实验中触发系统的设计与应用情况。系统中使用了一台266 nm 四倍频Nd:YAG激光器，单次触发输出参数为80 mJ,7 ns,0.5 mrad的激光脉冲，用于触发LTGS。激光器的触发源为两台DG535脉冲发生器，联合强光一号触发信号发生装置使用，保证了激光脉冲与开关电压峰值的同步性。触发系统在自击穿电压波峰前200 ns将激光脉冲馈入开关，在充气0.2～0.3 MPa条件下均能成功触发，得到了充气0.3 MPa时触发抖动3.86 ns的结果。

The paper introduces the design and application of a trigger system for the 2 MV laser triggered gas switch(LTGS), which was designed as the main switch for Qiangguang-Ⅰ accelerator. In this system, a 266 nm Nd:YAG laser was used, and a beam with a pulse energy of 80 mJ, a pulse width of 7 ns and a divergence angle of 0.5 mrad was achieved when the laser was triggered. The two original trigger signals of this trigger system were generated from the trigger system of Qiangguang-Ⅰ, and they were delayed by two DG535 generators, respectively. A laser beam was focused in the LTGS through the crossover tube at 200 ns before the maximum of the self-breakdown voltage. In experiments, the trigger system worked well when SF6 was filled in switch and the gas pressure was 0.2 to 0.3 MPa, and the trigger jitter was 3.86 ns at the gas pressure of 0.3 MPa.