Ordos Basin is the second largest sedimentary basin in China with very rich oil and gas resources.However, the exploration targets are typical reservoir s of low permeability, low pressure and low output .The exploration and development become more and more difficult due to the restriction of objective factor s such as poor reservoir properties, strong subtle characteristics and complicated surface covered with loess and desert. Based on the objective reality of the exploration and development, through independent innovation, Changqing Oilfield Company successfully implemented technological breakthroughs of more than 0.5×10 ^{- 3}μm² low permeability oil-gas field exploration and development, and developed a series of techniques for low permeability field exploration and development in the aspect s of high-resolution seismic exploration, subtle reservoir integrated exploration, well pattern optimization, advanced water injection. Recently, the effective development technologies for 0.3 ×10 ^{- 3}μm² ultra-low permeability eservoir and Sulige Gas Field have a great breakthrough, which promote domestic and foreign development to the low permeability reservoir, and enhance the growth of oil and gas resources.