The tensile creep behavior of extruded Mg-6Gd alloy,having the tensile yield strength of ～ 110 MPa at 175 ℃,has been investigated under 175 ℃ and 150 MPa.In this study,the extruded Mg-6Gd sample exhibits the total tensile strain of ～ 10.5％ after the creep time of 1100 h,and the fast plastic strain of ～ 4.6％ at the beginning of the creep test.The microstructure result suggests that the dislocation deformation is the main deformation mode during creep,and the grains with orientation close to ‖ ED disappear after creep.The creep process containing a low creep strain has no effective promotion for the precipitation compared with the aging process without strain.The origination of creep crack is related to the formation of precipitate-free zone during creep.The work offers an important implication to research the microstructure evolution under an applied stress in a weak aging response Mg alloy.