Abstract: One-pass rolling deformation was carried out on X80 pipeline steel with a thermal simulator in the recrystallization zone (1 000℃), and the deformation amount was 25%, 30%, 35%, 40%, respectively. The effect of deformation amounts on the microstructure, grain misorientation, grain size and texture was studied. The results show that the microstructures of the tested steel under different deformation amounts were mainly martensite, and bainite appeared when the deformation amount increased to 35% and above. With the increase of deformation amounts, the grain misorientation distribution had no obvious change, and the grain size became finer and more uniform. Increasing the deformation amount could reduce the intensity of the recrystallization texture 110〈110〉, meanwhile the deformation texture such as 112〈110〉 appeared.