The previous work showed that the precipitate coarsening of T91 (Modified 9Cr–1Mo steel) was described by an empirical relationship depending on applied stress. However, there is another possibility that the stress dependent coarsening is merely apparent and strain dependent actually. In the present paper, an attempt was made to re-analyze the previous data based on a model in which the effective diffusivity of solute is strain dependent. The result of analysis suggests strongly that the dislocation dragging solute atmosphere causes the enhancement of solute diffusivity and leads to the promoted growth of precipitates.