In order to obtain the glass welding seam with good shape and few pores, the method of adding opaque glass frit to the middle layer was used to study the porosity problem in the laser welding of glass. A complete set of welding equipment for laser welding of glass and glass was built with semiconductor laser as the heat source. By analyzing the characteristics of porosity distribution, counting the porosity of weld, measuring the size of porosity, comparing the difference between the front and backside of the weld, the influence of laser average power, welding speed and other process parameters on the formation of porosity and the surface morphology of weld was studied. The results show that when the laser power is too small and the welding speed is too slow, it is not conducive to inhibit the generation of pores in the weld, and the glass plate may not be welded. With the increase of laser power and welding speed, the porosity in the weld increases significantly. When the laser power P, the welding rate v, and the defocusing amount d is respectively set to beequals 35W, 0.1m/min, and -15mm, a well-formed weld with a pore diameter of less than 3.696μm and a uniform distribution can be obtained, and the connection strength is high. This research can provide a theoretical basis for laser sealing of glass, and has a wide industrial application prospect.