The load (p) -deflection (d) curves, creep curves and transverse-rupture strength of Ti(C, N)-Mo₂C-Ni alloys were examined at 1273 K as functions of nitrogen content, particle size of carbonitride and domain size of binder. The deformation of the alloy at low stress level was suppressed greatly with increasing the nitrogen content and slightly with decreasing the particle size. However, the apparent deformation at high stress level was enhanced with decreasing particle and domain sizes in particular in the alloys containing nitrogen. It was noted that the high temperature transverse-rupture strength, creep rupture time, etc. were closely related to the apparent deformation.