Abstract: The titanium alloy pipe and low-carbon steel electrode were welded on the glass ceramic plate of laser gyroscope. The glass ceramic plate ruptured after low temperature trial. The fracture surface and cracks of the glass ceramic plate were inspected to analyze the rupture reason. The results showed that the peel damage found along the welding zone around the fixing hole of glass ceramic was related with the tensile stress from the inconsistent deformation owing to the different thermal expansion between metal and glass ceramic. The failure could be prevented by adopting proper materials to decrease thermal expansion difference and controlling trial temperature.