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This study is aimed to grasp the destressing phenomena in English words, and to attempt to reformulate the rules of destressing and rhythm as a single rule. The commonest function of destressing is that of trimming the overgeneration of the stress rules, thus making possible a maximally general formulation of the latter. Destressing rules have given a wider scope ever since SPE. The major reason for this resides in the tendency to generalize and to constraint the stress rules. ChapterⅠpresents the concept of destressing and the purpose of this paper. Chapter Ⅱ surveys the destressing rules in the Metrical Theory: LP, Foot, and Grid. In LP, Initial and Medial Destressing and Prefix Rule are collapsed into one rule. However, this rule is very complicated, and somewhat problematic. Hayes(1981) translated the various linear destressing rules into the foot-based metrical format: Prestress Destressing, Sonorant Destressing, and Arab Rule. The grid-only format of destressing consists of beat deletion, Selkirk(1984) exploits the maximally simple format of beat deletion to collapse into one rule, Monosyllable Destressing. Here, different syllable weight conditions are integrated into a general hierarchy. Although the collapsing of closed syllable destressing is attractive, it is clearly less accurate than the individual rules whose function it has to take. Chapter Ⅲ examines the Stress Retraction Rules and the destressing phenomena. The purpose of this chapter is to show that the contexts of the heavy syllable destressing and Strong Retraction are largely identical in the function of Primary Stress Retraction and Secondary Stress Retraction, and that Strong Retraction can be replaced by three destressing rules: Light Syllable Destressing, Sonorant Destressing, and Arab Rule. The results are as follows: (a)Retraction across VSon is wide-spread across lexical categories; (b)Retraction across VObs is slightly more restricted, and governed by the context of Arab Rule; (c)V/s/ shares the retraction properties of light syllables; (d)Retraction across underlying VV is lexically diffuse. Chapter Ⅳ explores the possibility of one general rule unifying Destressing Rule and Rhythm Rule in the three leading theories. (a)In Bracketed-grids theory, Halle & Vergnaud(1987)`s analysis eliminates the need for two separated, ordered stress rule as English Stress Rule and Stress Retraction Rule in Hayes(1981). Moreover Sonorant Destressing is rendered superfluous in underived words, since these regularly undergo Stress Conflation and Rhythm Rule. But this advantage is bought at the heavy expense of overgener-alization. (b)In DTE theory, Hammond(1984) proposes Clash Resolution Hypothesis, which renders reference to the shape of context feet and focus feet superfluous. It allows one to collapse together Prestress and Poststress Destressing, and Word-internal Rhythm into one general rule. Hammond claims that no reference to weight is required in destressing itself. Weight conditions are transferred to the vowel reduction rule, which is limited to light rimes. However, Hammond`s essential claim that destressing is quantity-insensitive runs into problems. (c)In OT theory, Hammond (1999) has provided the constraints and the full ranking needed for English stress as follows: {NG, USC, WSP(VV), WSP(VV), WSP(VC): ≫ FAITH( ) ≫ FTBIN ≫ PARSE- ≫ ALIGN-R. However, several constraints must be revised and several added. Chapter Ⅴ concludes the paper by summarizing the results of every chapter.