A novel colliding-enhanced cavity is reported. It has low threshold and energy output of 100 mJ. Self Q-switched pulse duration is 20 ns, with 1.3 mrad of the angle of divergence. In some extent, the higher the pump voltageis, the narrower the output pulse widths; The longer the length of phase conjugate resonator, the wider the pulse widths; The shorter the focal length of the lens, the narrower the pulse widths; the longer the cell and focal length, the higher the output energy and the smaller the angle of divergence. The results of pulse widths and output energies and the angle of divergence in different conditions are given.