The high-temperature plastic deformation behavior of 2 200 MPa grade ultra-high strength steel was investigated using a Gleeble 3 800 thermal simulation test machine. The stress-strain curves of high-temperature tensile deformation at strain rates of 0.1 s

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and 0.001 s

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within the temperature range of 750 ℃-1 100 ℃ were obtained. Metallographic observation and EBSD analysis were conducted on the microstructure of the longitudinal section near the fracture surface， and scanning electron microscopy （SEM） was used to observe the fracture morphology. The high-temperature plasticity and dynamic recrystallization behaviors of 2 200 MPa grade ultra-high strength steel were investigated. The research results showed： 1） At both strain rates， the tensile strength of the test steel continuously decreased with increasing deformation temperature； 2） at the strain rate of

0.1 s

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， the reduction of area increased with increasing temperature during tensile deformation at 750 ℃-1 000 ℃， and decreased with increasing temperature when T

>

1 000 ℃； at the strain rate of 0.001 s

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， the reduction of area showed two troughs， near 800 ℃ and 925 ℃， respectively； the reduction of area peaked at T=1 050 ℃， after which it decreased with increasing temperature； 3） based on the strength and reduction of area， the forgeability of the test steel can be calculated. At the strain rate of 0.1 s

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， the forging temperature range of the test steel was 880 ℃-1 100 ℃， and at the strain rate of 0.001 s

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， the forging temperature range was 850 ℃-1 100 ℃； 4） when the deformation temperature was ≥1 050 ℃， high-temperature molten dendrites appeared on the tensile fracture， and the initial forging temperature should be below 1 050 ℃； 5） when the strain rate was 0.001 s

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， the onset temperature of dynamic recrystallization was 750 ℃. When the strain rate was 0.1 s

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， the onset temperature of dynamic recrystallization was 880 ℃. When the deformation temperature was ≥ 900 ℃， the grain size at the strain rate of 0.1 s

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was finer than that at a strain rate of 0.001 s

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， so the rapid forging process should be adopted in the early stage of forging； when the deformation temperature is less than 900 ℃， the dynamic recrystallization fraction is higher at a strain rate of 0.001 s

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. Therefore， a slow forging process should be adopted in the later stages of forging to obtain a uniform and fine forged microstructure. The optimal forging temperature range for 2 200 MPa grade ultra-high strength steel is between 880 ℃ and 1 050 ℃.