This study, grounded in Autosegmental-Metrical Phonology, investigates the intonation production of English learners from the Guanzhong dialect region of Shaanxi and explores the potential influence of their L1 on observed deviations. Eight learners from this region participated in the study, which examined their intonation patterns across three sentence types: statements, yes-no questions, and wh-questions. The results revealed that: 1)phonologically, learners produced multiple pitch accents in statement, yn-questions, and wh-questions, accompanied by misplacement of nuclear accents; 2)phonetically, they demonstrated systematic deviations in focus marking, primarily reflected in limited prosodic cues for signaling focal information in sentences, i.e. duration lengthening, intensity expansion, post focus compression, etc., were rarely observed in their focus realization; also, learners showed no awareness that broad focus and narrow focus convey different sentence-level meanings and therefore require distinct pitch patterns for proper realization; they were unaware that changes in boundary tone patterns can also alter the meaning and communicative function of a sentence.