Abstract: As a precision instrument, the shell structure of the semiconductor laser is crucial to the stability of the laser’s output power. Based on the finite element analysis of the shell with the software ANSYS Workbench, the first 8 natural characteristic frequencies and corresponding vibration modes of the shell have been obtained, and the weak links of the shell have been found. The experiment verifies the effect of the optical path module installed in the weak and non-weak parts of the shell on the output power of the semiconductor laser. The simulation results show that the vibration mode of the shell is characterized by global and local deformation, and the weak links are mainly located at the geometric center of the shell. The experimental results show that the maximum error of the output power is 10% in the weak part while 4% in the non-weak part by comparing the actual output power under different positions of the shell. It provides a reference for optimizing the structure design of the semiconductor laser and improving the stability of its output power.