Abstract: The temperature variation and residual stress after hot rolling of stainless steel/carbon steel composite plates with different reduction rates were calculated by thermodynamic coupling finite element simulation. The results show that after rolling, for carbon steel, the temperature of the sample with reduction rate of 20% is 18 ℃ lower than that of the sample with reduction rate 10%. For stainless steel, when the reduction rate is 35%, the temperature drop rate is significantly faster, and the temperature is 52 ℃ lower than that of the sample with reduction rate of 10%.The sample with reduction rate of 40% temperature is 67 ℃ lower than the reduction rate 10% sample temperature. When the reduction rate increases from 10% to 20%, the average residual stress increases from 63.7 MPa to 81.7 MPa. When the reduction rate is increased to 35%, the average residual stress is 141.5 MPa. The reduction rate 40% sample has the highest residual stress. The experiment results show that the volume fraction of pearlite in carbon steel decreases with the increase of the average residual stress.The pearlite volume fraction of the unrolled sample is 12%.When the reduction rate reaches 40%, the pearlite volume fraction is only 5%.