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Low-porosity and low-permeability reservoirs in western Sichuan are characterized in poor physical property��inconstant lithology��diversified reservoir space type and complex pore structure�� Thus��the traditional methods of well logging evaluation in reservoir parameters are limited in many ways��which is the main factor in restriction of the reservoir evaluation�� Based on the basic character analysis of reservoirs such as physical property�� pore structure and probability theory��a set of evaluation methods of reservoir parameters is established and developed�� Practical application showed that these methods not only greatly improved the dependability of parameters evaluation�� but also enlarged the application range of model in low-porosity and low-permeability reservoirs��