In order to investigate the transmission capability of hollow core fibers for nanosecond pulsed lasers,1064 nm pulsed laser transmission experiments are carried out using a Kagome type anti resonant hollow core fiber.The core diameter of the fiber is 60um and the numerical aperture is 0.02.Using an electro optic Q modulated laser with a central wavelength of 1064 nm and a pulse width of 8.4 ns as the light source,the beam pattern and energy transfer effect of the fiber in nanosecond pulsed laser transmission are tested.The results show that the hollow core optical fiber is capable of stably transmitting nanosecond pulses of 10.25 mJ with transmission efficiency as high as 88% while maintaining the fundamental mode.In addition,the damage mechanism process of high power pulsed laser on the hollow core fiber is systematically analyzed.The results show that the Kagome type anti resonant hollow core fiber is capable of transmitting 10 mJ nanosecond pulses in the 1064 nm band and can be used as a flexible light source for applications such as laser triggered vacuum switching technology.