In order to investigation the forging permormance of a New type Nb-based alloys, the deformation behavior of this alloy is researched at temperature range 1000－1200℃ and strain rate range10_-1－10s_-1 with a Gleeble-3500 machine by hot compression. The results show that the flow stress is controlled by both strain rate and deformation temperature,the flow stress decreases with the increase of temperature,while increases with the increase of strain rate．The high-temperature deformation obeys a power-law type equation. The stress exponent n is evaluated to be 12.03 and the apparent activation energy is 577.06 kJ/mol, and the constitutive equation that reflects how the thermal mechanical parameters influence the forming of material is regressed．