In this paper, a new method of obtaining multi-coherent-beams by UR90 resonators coupled with forward-mode was given, by which a problem was called “detune” existing in method of backward-mode was resolved, and the reliability of system was enhanced obviously. The far-field intensities and divergence angles of combined beam of two copper vapor lasers with UR90 resonators coupled at small magnification (M=1.21) were measured and analyzed experimentally. The results demonstrated that the mode-control ability and far-field intensity distributions of UR90 resonators coupled by forward-mode are still good.