Semiconductor laser has made great progress in technology and application since its birth.As an optoelectronic device with high precision,its reliability research has very important practical significance.In view of the present laser reliability research problems,first of all,after the analysis of the factors and laws of laser performance degradation,the recoverable degradation model of semiconductor laser based on competitive failure theory is established,this takes the performance degradation of semiconductor laser into consideration.Secondly,considering the correlation between the variation law of shock failure threshold and the total amount of shock degradation,the reliability variation law of semiconductor laser under the non deterministic threshold is deduced.Finally,the reliability degradation law of the semiconductor laser is evaluated by using the example data,and the reliability degradation situation of the laser with defined threshold and non defined threshold is obtained,and compared with the existing model,which verifies the effectiveness and feasibility of the model presented in this paper.