Based on the faults systems interpreted from seismic data, fractures characteristics from drilling and logging data, carbonate reservoirs are studied from acoustic emission, stress measurement, rock mechanics parameters and uniaxial tensile test. Considering the influence of faults on the fracture forming, 3D finite element method is applied to simulate the period II Middle Caledonian paleo -structural stress field in the Tazhong area and predict the distribution of fractures. The result shows that during fracturing the maximum major stress effective value range from 47.9 to 58.3 MPa, with average 51.97 MPa, tensile strength ranging from 5.13~6.91 MPa, with average 5.81 MPa. High value area of effective tensile stress is the favorable area for structural fractured reservoirs development, most distributed in the interchange area of fracturing belts and part section of fractured zone in the east of Tazhong area.