Jurassic reservoir in Northwest edge of Junggar Basin exists apparent difference in reservoir rock type. The controlling effects of reservoir rock type upon reservoir property are also apparent. There are a few pore types in reservoir rock, but different pore types have apparent difference from each other in several aspects such as pore scale, abundance and effectiveness, in which secondary solution pore, initial intergranular pore and residual intergranular pore are the most important effective pore types. Good linear relation exists between log permeability and porosity, based on the relation a series of certain limits are defined to evaluate reservoir property. The 5 grades are subdivided correspond to the prevalent sorting grades of sand reservoir to some extent. By cluster analysis on a large number of mercury injection parameter samples, pore structure is subdivided into 4 types. Through contrast of the statistical parameters and typical curve shape, effectiveness of each pore structure type is evaluated quantitatively and qualitatively. Finally, porosity and permeability grade, pore type, pore structure type and reservoir rock type are combined to give a synthetic evaluation on Jurassic reservoir of Northwest edge in Junggar Basin.