Abstract: In order to study the effects of deformation conditions and initial grain size on the dynamic recrystallization behavior of316 LN austenitic stainless steel,single pass hot compression tests were conducted on a Gleeble-1500 D thermal-mechanical simulator with the deformation temperature of 900-1200℃,the strain rate of 0. 001-10 s^-1,the true strain of 0. 1-0. 9 and the initial grain size of 122-297 μm. It is obtained that the ratio of critical strain to peak strain and the ratio of critical stress to peak stress are 0. 38 and 0. 89,respectively. A dynamic recrystallization kinetic model and a grain size evolution model were established based on experimental data. In addition,the developed models were modified for DEFORM-3D finite element simulation. It can be found that the simulated values by the modified model and experimental data agree well,indicating that the modified models have good accuracy.