Abstract: The demonstrated reserves of low-permeability reservoirs in China increase year by year. The non-producing reserves of low-permeability reservoirs amount to a relatively high percentage of the all non-producing reserves in China. Based on the geochemical analysis of 2200 core samples collected from the peripheral zone of the Daqing oil region, the Changqing, Jilin and Huabei oil regions and integrated with the current situation of several major low-permeability reservoirs developed by PetroChina Company Limited, we proposed a number of parameters to evaluate low-permeability reservoirs, such as the radius of main flow throat, percentage of movable fluid, threshold pressure gradient, viscosity of oil and content of clay minerals. Meanwhile, the classification limit of various characterization parameters were determined and differences in these parameters for the main low-permeability reservoirs were compared, which has deepened our understanding about low-permeability reservoirs. Thus, a comprehensive evaluation method for low-permeability reservoirs was proposed. The result shows that the correlativity between reservoir classification coefficients and the deliverability of a single oil well is guite good. Based on these data, we carried out a reservoir classification evaluation on low-permeability reservoirs in the Changqing, Daqing and Jilin oil regions, and determined various permeability ranges corresponding to different classification ranks of these oil regions. This work will play a guiding role in optimizing producing regions and investment blocks, and will provide technical supports for oil companies to determine the future exploration targets in low-permeability reservoirs, to set down technique countermeasures for exploiting low-permeability reservoirs and to redetermine frontiers of producing pays.