The acoustic impedance of fluid-filled fractures has a significant difference with that of rocks. The energy of the sound wave decays when the acoustic wave passes the fractures. In order to effectively identify the single-well fracture sections in tight sandstone gas reservoirs，based on the EXDT full wave processing data in Area K of Ordos Basin，the array acoustic wave amplitude attenuation features were analyzed and calibrated by the core analysis，thin slice observation and micro-resistivity imaging data. The response characteristics of the increment of the acoustic amplitude attenuation values were clarified，and the cutoff values were determined as：the compressional amplitude attenuation value is more than 12.5 db/m，the shear amplitude attenuation value is more than 13 db/m，and the Stoneley wave amplitude attenuation value is more than 5.6 db/m. As a result，the identification of single-well fracture sections was well achieved. The case analysis of Area K in Ordos Basin shows that the fractures in Layer Qian5，He2，He4 and He6 relatively develop corresponding to a significant amplitude attenuation of array acoustic wave，and have a good correspondence with the main producing interval.The fractures improve the permeability of tight sandstone reservoirs obviously and contribute positively to reservoirs productivity. Therefore the accurate identification of the single-well fracture section has a guiding significance for the perforation.