As one of the promising plasma-facing materials in fusion reactor,tungsten will inevitably be exposed to high-fluxes of plasma species(deuterium and tritium).Deuterium behavior in polycrystalline tungsten has been widely investigated.In general,mirror polished surfaces are experimentally used.Mechanical polishing is usually followed by a stress-relief annealing.The early-stage process of the stress-relief annealing is supposed to remove the residual stresses induced by the mechanical polishing and exclude their influence on the study.However,the real influence of this treatment is not well-known.The aim of this work was to study the effect of residual stresses on the behavior of deuterium in tungsten.