Abstract: Wedge-shaped quartz stone strips were added as an additional dielectric layer to study their influence on dielectric barrier discharge. The influence of wedge-shaped dielectric layer on dielectric barrier discharge was studied experimentally and simulated using simulation software. It is shown that the wedge-shaped dielectric layer has a great influence on the dielectric barrier discharge. The discharge breaks down near the tip of the wedge-shaped dielectric layer firstly and diffuses along the surface of the dielectric layer. A "low valley" of the electric field intensity appears inside the wedge-shaped dielectric layer, which increases the electric field intensity near the tip. The wedge-shaped dielectric layer changes the area of the dielectric layer. The accumulated charge on the dielectric surface changes the spatial electric field distribution, which has a great impact on the breakdown, the electron density, and the electron temperature. The discharge priority issue induced by the thickness of the dielectric layer provides more flexibility for related designation.