Abstract: Compression creep tests under constant stresses (200-550 MPa) and compression tests at constant strain rates (1×10^-5,5×10^-5,5×10^-4 s^-1) were conducted on commercially pure titanium TA2 at room temperature. The compression creep behaviour was described by power law equation (creep equation). The compression rheological behaviour was described by modified Arrhenius equation (compression constitutive equation). The relation between parameters of comperssion creep equation and compression constitutive equation was established and modified by creep critical stress. The prediction model for room temperature compression creep was obtained on the basis of compression test data and verified by expriments. The results show that the compression creep critical stress at room temperature of commercially pure titanium TA2 was 252 MPa. The room temperature compression defromation behaviour of commercially pure titanium TA2 were expressed well by the modified Arrhenius equation. The relative errors between the creep curves by the prediction model for room temperature compression creep and the tested curves were all below 10%, indicating that the model was accurate.