Abstract: Based on the theory of crystal plasticity, a finite element model of the crystal plasticity of P92 heat-resistant steel considering the dislocation hardening effect was established.The model was used to simulate the plastic deformation behavior of P92 steel in the stretching process, and the influence of different slip systems on the plastic deformation was furtherly explored.The results show that the stress-strain, dislocation density and deformation storage energy of P92 steel present an uneven distribution after deformation, confirming that the grains undergo uneven plastic deformation.Among them, the dislocation movement is the carrier of plastic deformation, and the dislocation plugging at the grain boundary causes stress and strain concentration and deformation storage energy increase.At the same time, the plastic deformation is affected by the activation of the slip system.Compared the tensile curves of the model under different slip systems, it is concluded that110<111> as the main slip system plays a decisive role in the uniaxial tensile deformation process.