An experiment of laser beam propagation in the atmosphere with stimulated Brillouin scattering (SBS) phase-conjugated compensation at long distance (10.5 km) is reported. On the normal atmosphere condition of a city, the conversion efficiency of the SBS phase-conjugated laser is about 4.4% through a 10.5 km distance, which is 2.4 times than the normal laser transimission efficiency on the same condition. Meanwhile, the phase-conjugated laser neturns to the emission position through the original path, and assembles again.