Three different plasticity index subgrade soil are selected from seasonal frozen soil region. Static triaxial test is executed on the samples exposed to 0 to 7 times closed-system freeze-thaw cycles under different confining pressures. Resilient modulus is obtained from the line segment of deviator stress-strain curve. The results show that the resilient modulus of the same kind of soil increases with confining pressure; under the same freeze-thaw cycles, Resilient modulus with the same confining pressure decreases with the number of freeze-thaw cycles; Under the same confining pressure and the same freeze-thaw cycles, resilient modulus increases with the plasticity index. The exponential function is adopted for multiple nonlinear fitting. The relationship between resilient modulus and confining pressure, plasticity index, freeze-thaw cycles is obtained and shows a good correlation.