After the laser welding of the receptacle and the sleeve, the coupling efficiency will fall obviously. In order to study this problem, based on finite element thermal theory and structural coupling theory, laser welding model was developed and the post-weld shift was calculated. According to the experiment, compared to the devices without compensation, the coupling efficiency has increased 50% after the compensation of the PWS. This result has a certain guiding significance for the packaging development and production of high-speed optical devices, especially multi-channel integrated optical devices.