本文在非傍轴近似条件下利用几何光学理论推导了激光陀螺实验中谐振腔大小、反射镜曲率及偏转角度等因素与腔内自再现谐振激光空间位置关系的公式，比较了其与通常傍轴近似下矩阵光学结果的差异，讨论了实验时调节反射镜偏转角度对谐振腔有效腔长、光路面积、陀螺比例因子及激光出光位置的影响规律，对激光陀螺实验中谐振腔的调节有指导意义.

 Under the condition of non-paraxial approximation, a formula of the relationship between the cavity size, mirror curvature, deflection angle and the space position of self-reproduction resonant laser in the laser gyro experiment is derived by using geometric optics theory. The difference between the formula and the matrix optical results under the usual paraxial approximation is compared. The effect of adjusting the mirror deflection angle on the effective cavity length, optical path area, gyro scale factor and laser output position is discussed, which has guiding significance for the adjustment of resonator in laser gyro experiment.