The dynamic recrystallization (DRX) behavior of Maraging250  steel at temperature of 1020-1150 ℃ was studied by designing high-flux biconical specimen and producing gradient strains in different regions of one single thermal compression specimen. Then, the microstructure near the center line of the vertical section of each biconical deformed specimens was quantitatively analyzed by finite element numerical simulation, optical microscope (OM ) and electron backscatter diffraction (EBSD ) technology, the content of DRX was determined, and the kinetic curves of Maraging250 steel at different deformation temperatures were established. The results show that after thermal compression of the biconical specimen, the equivalent strain is continuously and symmetrically distributed along the center line of the vertical section, the strain gradually increases to 1.7 from the edge to the center, and the internal deformation temperature is basically stable at 972-985 ℃. During the thermal compression process, continuous strain DRX occurs in Maraging250 steel and its kinetic curves show a typical ‘S’ shape feature. DRX volume fraction increases at the highest rate in the middle stage of deformation, and the growth rate is slow in the early and late stages of deformation. With the increasing of deformation temperature, the strain required for the nucleation process of DRX decreases, and the maximum growth rate of DRX volume fraction increases obviously, but the strain required for complete DRX changes slightly at each deformation temperature.