The confinement has important effects on the capability of laser ignition. It can affect the delay time and the ignition threshold of energetic materials. So it is of key importance in the design of laser ignition element. Experiments were done to research the effects of confinement on the ignition capability of B/KNO3 and B/KNO3/ phenolic resin by the laser whose wavelength is 1.06 μm. Three kinds of confinement were used. They were air,K9 glass,and K9 glass deposited with copper film. The results show that when reactions occur near to the surface,gaseous products are confined by K9 glass,and the high external pressure will augment the ignition threshold of energetic materials and reduce the delay time. The effect of the K9 glass deposited with copper film is to enhance the plasma near the surface of energetic materials,which reduces the delay time but lowers the ignition threshold,because the copper film reflects a part of the laser and a big part energy of the laser is used to generate the copper plasma.