The creep behavior of the DZ411 alloy at 950°C and 190 MPa was studied using high-resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM). The relationship between the deformation mechanism of the γ" phase and the strain rate during creep was elucidated. At various creep durations, the alloy forms a raft structure due to the directional diffusion of elements. Because the length of the rafted γ" phase is significantly extended, the impeding effect on dislocations is greatly increased. Consequently, in the early stages of creep, the strain rate of the alloy is higher, with a total strain variation of 0.31% and a strain rate of 0.1% per hour before the rafting of the γ" phase. As the rafting process of the γ" phase progresses, the impeding effect on dislocations also increases, and the alloy enters a steady-state creep phase, where the strain rate significantly decreases, with a total strain variation of 2.35% and a strain rate of 0.0078% per hour. However, when the alloy stress accumulates to a certain extent, dislocations will enter the γ" phase through a climbing mechanism. A large number of dislocations cutting into the γ" phase adversely affect the continuity of the raft structure, reducing the effective length of the γ" phase, significantly weakening the impeding effect of the dislocations, and causing the alloy to enter an unstable state. This accelerates the creep process and ultimately leads to the alloy"s fracture. The total strain variation in this stage is 17.05%, with a strain rate of 0.08% per hour.