Fiber optic gyroscope (FOG) is a multi-technology product which integrates optics, mechanics and electricity. It has the advantages of high reliability, long life, light weight, small size and "all solid state". It has been widely used in military and civil fields such as sea, land, air, sky and submarine, and has become the mainstream gyroscope in the field of inertial technology. With the widespread application of FOG, the degradation of its key performance indicators gradually emerges as time goes on. Therefore, it is urgent to obtain the reliability index of FOG. In order to obtain reliable reliability index of FOG with time and cost saving as much as possible, it is necessary to choose reasonable acceleration test method, acceleration model and life distribution model to study the acceleration life model of high precision FOG. To this end, this paper carries out the following aspects of work: (1) The basic composition and main reliability index of high precision fiber optic gyroscope are introduced. (2) The sensitive stress of high-precision FOG is temperature and humidity. A high-precision FOG acceleration model based on temperature-humidity double-stress Peck model is established for the first time. (3) The life distribution model based on drift Brownian motion is analyzed, and the applicability of the life distribution model is determined by Monte Carlo simulation combined with the acceleration model of Peck model. (4) According to the performance degradation data of accelerated life test of FOG, the reliability of life distribution model of high precision FOG is evaluated.