Abstract: The Oilfield A is located in the east of Bohai Sea, at the junction of the Tan-lu fault and the Zhangpeng fault where small scale faults are well developed. The conventional coherence algorithm is easily affected by noise and hard to be used in small scale faults description effectively. A more accurate fault description method is required. In this paper, a characterization method for small scale fault based on fault plane model is adopted. By constructing structural tensor, eigenvalues and eigenvectors of matrix are extracted to construct fault attributes. Then through the correlation of adjacent points, the extension distance of the fault is defined. Analysis of actual data suggests that the ability to depict small scale faults and the interpretation of small structures are much improved using this method in the Oilfield A.