Abstract: The basic concept of adjust-free solid state laser was introduced. The latest progress of adjust-free solid state laser used for smart and light laser, multiple wavelength output, and improving the beam quality of high power/energy laser were generally summarized. The development trend of double corner cubes resonator was also introduced. At last, the latest progress of mutual injection phase-locked lasers combination based on corner cube was reported. The mutual injection phase-locked coherent combination of both fiber lasers and solid state lasers have been realized. And these researches indicate that it is an effective way to obtain high reliable, high power /energy and high beam quality laser output.