The flow behavior and hot deformation microstructure evolution of the 9Cr-2W heat-resistant alloy were investigated at 1000-1300 oC and strain rates of 0.005-0.5 s-1 by a hot compression test. And the textures of hot upsetting samples were determined. Characteristics of stress-strain curves of the alloy deformed in the test parameter range were analyzed. The important parameters, such as stress exponent and deformation activation energy were obtained by the kinetic equation. Results of microstructure observation and texture tests indicate that the microstructure evolution mechanism of the 9Cr-2W heat-resistant alloy is dynamic recovery accompanied by geometric dynamic recrystallization. The alloy can be produced at a higher temperature in order to reduce the flow stress and to improve the anisotropy in the practical production.