In order to determine long-term strength of hipparion red clay in east Gansu Province, the direct shearing creep tests staged shear loading were carried out using the improved direct shear apparatus and the direct shearing curves under three vertical consolidation pressures were obtained from the tests result. Based on the fitting parameters analysis of Burgers creep model curves, a new method of long-term strength determination for hipparion red clay is presented using the maximum curvature point of the relation curve between the viscosity coefficient of Maxwell component and shear loading. The proposed method of long-term strength determination is validated through the comparison with the values of long-term strength determinated by the methods of transition creep and isocharonous curve. The proposed method of long-term strength determination and the test results can be benefit to stability evaluation and treatment for landslides controlled by hipparion red clay in loess plateau.