To study the numerical modeling method for mechanical behavior of stainless steel under cyclic loading, based on the OpenSees platform, the test results on specimens of austenitic stainless steel and duplex stainless steel under cyclic loading at home and abroad were simulated, and the quasi-static test results of precast segmental bridge pier with austenitic stainless steel were also simulated. All the simulation results were compared with the test results. It is found that the simulated stress-strain hysteresis curves of stainless steel under cyclic loading agree well with the test results, and the numerical model could predict the response of the austenitic and duplex stainless steels under different cyclic loading modes. The mechanical behavior of stainless steel under monotone loading is different with that under cyclic loading, so it should be modeled and valued separately. The simulation results of hysteretic behavior of the precast segmental bridge pier with austenitic stainless steel agree well with the test results, which further verifies the accuracy of the modeling method proposed in this paper.