Using tho Stimulated Brillouin Scattering (SBS) in high pressure gas SF6 as a phase conjugating mirror in a Nd:YAG laser resonator, we have got laser pulses with the pulsa energy of about 100 mJ. The spatial mode of output beam is much better than the output beam from the phase conjugate resonator based on the SBS in liquids. The power density of about 150 MW/cm2. And nearly TEM00 mode are obtained. The stability of tho output energy is also increased.