The uniaxial time-dependent strain cyclic behaviors and ratcheting of SS304 stainless steel were studied at high temperatures (350 °C and 700 °C). The effects of straining and stressing rates, holding time at the peak and/or valley of each cycle in addition to ambient temperature on the cyclic softeninglhardening behavior and ratcheting of the material were discussed. It can be seen from experimental results that the material presents remarkable time dependence at 700 °C, and the ratcheting strain depends greatly on the stressing rate, holding time and ambient temperature, Some significant conclusions are obtained, which are useful to build a constitutive model describing the time-dependent cyclic deformation of the material.