Abstract: Optical power fluctuation will reduce the accuracy and stability of the atomic sensing system. In order to evaluate the influence of optical feedback on the accuracy and stability of miniature atomic sensing system, the optical power fluctuation of self-mixing interference signal caused by optical feedback with the semiconductor laser source and optical element used in miniature atomic gyroscope system was tested. The optical power fluctuations caused by polarizer, λ/4 wave-plate, atomic cell and aspherical lens were measured by moving piezo inertia stage, and the potential influence of the environment on the optical power fluctuations was analyzed. It is found that the maximum power fluctuation caused by polarizer, λ/4 wave-plate, atomic cell, and aspherical lens are 4.8%, 3.46%, 6.62% and 1.75%, respectively. The optical feedback effect can be significantly suppressed by tilting optical elements. A tilting attenuator is used to suppress the optical feedback effect for the optical elements which are inconvenient to tilt without changing the optical power received by the elements. This work can provide a reference for the miniaturization of atom sensing systems using 795 nm distributed Bragg reflection semiconductor lasers.