Abstract: Fracture is the main factor to determine oil and gas production capacity in low permeability reservoir. Only by acquiring the information of the fracture development in the formation can the reservoir be evaluated accurately. With the development of science and technology, more and more logging technology can be used in the identification of cracks, Such as: sonic logging, density logging, imaging logging, the full wave logging, dip logging, and PP wave logging technology which can identify fractures near borehole. In this paper, several methods of identifying fracture by logging curves are briefly introduced.