Based on macroscopic sedimentary characterization combined with rock flakes, cast thin, scanning electron microscopy, X-ray diffraction, mercury and physical property data. We conduct research on Pore formation mechanism of glutenite reservoir of Permian Lower Urho Formation,and find that there are three major void in the area,they are the remaining intergranular pore, laumontite dissolution pores and muddy shrinkage holes. The remaining intergranular pore formed because of the particulate support by gravel, related to Protective effect of Clay films. muddy shrinkage holes formed because of the transformation from illite / smectite to illite. laumontite dissolution pores formed because of alkali feldspar dissolution by Organic acids from the Fengcheng Formation source rocks. Madong 2 well zone is within the fan delta front, Mainly to braided river sediments glutenite. The main pore types are the remaining intergranular pore and laumontite dissolution pores. Xiayan 2 well zone is within the Internal fan delta front, Mainly to Underwater distributary channel glutenite and Mouth bar sandstone. The main pore type is laumontite dissolution pores. Underwater distributary channel glutenite of the fan delta front which is beneficial for laumontite formed early and late dissolution is favorable reservoir porosity development zones.