在有關漢語聲調與英語輕重音的借字研究中，英語重音與漢語聲調的對應並不一致，因此，本篇研究分別從語料庫與優選理論的觀點，重新檢驗漢語借字中漢語聲調與英語輕重音的關係。觀察語料庫發現英語重音傾向與包含高音 (high pitch) 的聲調對應，因此本文提ANCHOR-L(H,σ) 和ANCHOR-R(H, σ) 制約，分別要求英語重音節的H音高要固定在對應音節聲調的左端或右端。在*[+voiced]/[+H]- 和 *[-voiced]/[-H]- 的制約下，輸出值呈現voice enhancement的效果。換句話說，*[+voiced]/[+H]- 制約要求含有聲聲母之英語重音節與低起始音域的聲調對應；*[-voiced]/[-H]- 制約要求含無聲聲母之英語重音節與高起始音域的聲調對應。含有聲聲母之英語重音節可能對應到高平調或中升調，制約層級的改變能預測之。若ANCHOR-L(H,σ)與ANCHOR-R(H,σ)支配*[+voiced]/[+H]- ，則高平調被選出，但是，若 *[+voiced]/[+H]- 支配ANCHOR-L(H,σ) 與 ANCHOR-R(H,σ)，則中升調被選出。在RELCORR制約的要求下，對應重音節聲調的左端調值不低於對應輕音節聲調的左端調值。 / The studies of Mandarin loanwords adapted from English have suggested different tonal preferences in correspondence to English stress. This thesis reexamines the relationship between stress and tone in the English-to-Mandarin loanwords based on a corpus and the Optimality Theory. Two anchoring constraints, ANCHOR-L(H,σ) and ANCHOR-R(H,σ) are proposed to require the realization of the pitch accent H of the English stressed syllables, indicating the fact that English stress prefers a tone with a high pitch. The *[+voiced]/[+H]- and *[-voiced]/[-H]- constraints show a pattern of voice enhancement. *[+voiced]/[+H]- requires an English stressed syllable with a voiced onset to be adapted with an initially low-registered tone; *[-voiced]/[-H]- requires an English stressed syllable with a voiceless onset to be adapted with an initially high-registered tone. In addition, constraint re-ranking predicts the alternatively choices between the H-tone and the MH-tone for an English stressed syllable with a voiced onset. The H-tone is selected if ANCHOR-L(H,σ)and ANCHOR-R(H,σ) outrank *[+voiced]/[+H]-; whereas the MH-tone is chosen if *[+voiced]/[+H]- dominates these two anchoring constraints. The RELCORR constraint requires a left-edge tonal correspondence, where the left-edge pitch of a tone that corresponds to an English stressed syllable is not lower than one that corresponds to an English unstressed syllable.