A coherent combining scheme for two solid state lasers was proposed by using Michelson cavity technique. Based on constructive interference and destructive interference properties of two beam interferences, this scheme implemented the passive coherent combination of two lasers in consideration of the gain loss of a cavity. The phase-locking principle was analyzed in detail and the phase-lockings of two individual pulsed solid state lasers were experimentally demonstrated.Finally, the coherent combination output energy of 300 mJ/pulse was obtained, and its combination efficiency was 80%. These results show that the coherent combining technique proposed in this paper is characterized by self-choosing and self-adjusting and can offer a high combination efficiency.The technique can also be used in multi-beam solid laser coherence combination,for it solves the problem on the duty ra-tio in coherent combination.