Abstract: We study the rotational energy spectrum and deformation feature of very heavy nucleus ²⁴⁹Cm in the particle-triaxial-rotor model with variable moment of inertia. Such a nucleus is the unique one involving both multi-band structure and high spin states and locating very near the superheavy region. By
calculating the energy spectrum, we determine the configurations and quadrupole and triaxial deformation parameters β and γ of the nucleus. The calculated results indicate that the high spin band of ²⁴⁹Cm is built upon the ν[620](1/2)⁺configuration with deformation parameters β = 0.296 and
γ= 7.5^o and the bands based on the ν[622](3/2)⁺,  ν [613](7/2)⁺, ν[750](1/2)^- configuration respectively are also the ones with quite large axial deformation but small triaxial deformation.

Key words: near superheavy nucleus, energy spectrum, deformation parameters, particle-triaxial-rotor model