Abstract:Mudding citation of Badong formation widely developed, its distribution characteristics and the physical and mechanical properties have a significant impact on the stabilityof bank slope in the Three Gorges reservoir region. Taking the second paragraph (T2b2), third (T2b3) mudding citation of Badong formation as an object in Badong county BadongReservoir. T2b2,T2b3-1,T2b3-2 these three mudding citation widely distributed in the study area were taken X-ray diffraction analysis test, particle size distribution analysis test and direct shear tests, discuss the physical and mechanical characteristics of mudding citation. The results showed that: T2b2,T2b3-1,T2b3-2 three cements total content of mudding citation were 75%, 77.5%, 82.5%. Compared with T2b3-1and T2b3-2 , T2b2 mudding citation particle size distribution is more uniform , and there are large particles. T2b3-2 mudding citation particle size distribution is relatively concentrated. Three kinds of mudding citation shear strength parameters c is 6.208KPa, 9.52KPa, 13.86KPa, ? is 31.9°,29.3°,26.7°respectively. Mudding citation shear mechanical parameters c, ? value trends are strongly correlated with the total content and particle size distribution trends citationcement. The test results provide reliable mechanical parameters for reservoir bank slope stability analysis and prevention.