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Based on TapHOBCKH(H)s displacement field,equivalent strain expression was derived.And according to the dynamic recrystallization(DRX)critical strain,DRX process was determined by equivalent strain.It was found that equivalent strain distribution in deformed specimen is inhomogeneous,and it increases with increasing true strain.Under a certain true strain,equivalent strains at the center,demisemi radius or on tangential plane just below the surface of the specimen are higher than the true strain.Thus,micrographs at those positions can not exactly reflect the true microstructures under the certain true strain.With increasing strain rate,the initial and finish time of DRX decrease.The frozen microstructures of 20Mn23AlV steel with the experimental condition validate the feasibility of predicting DRX process by equivalent strain.