**Abstract**

Despite the plethora of research on speaking anxiety, most studies focus on speaking for general purposes in various bilingual contexts, particularly ESL/EFL (English as second/foreign language) contexts. Little research has been done on anxiety when speaking English for academic purposes in bilingual students. Even fewer studies are available on the interaction between academic oral communication (AOC) anxiety and expectancy-value beliefs —important concepts of language learning motivation. Hence, the present longitudinal study examined the interaction of expectancy-value beliefs and AOC anxiety in bilingual Chinese postgraduate students when learning academic oral English. In addition to interviews, a set of matching questionnaires on AOC anxiety and expectancy-value beliefs were collected from 74 Chinese postgraduate learners of English in week 2 (phase 1) and week 14 (phase 2) of a 16-week semester. Analyses of the data revealed the following major findings: (1) One-third to half of the participants experienced AOC anxiety and had low expectancy of themselves about AOC, and more than half of them held high attainment, intrinsic value, utility value and cost value of AOC in English, (2) significant increase occurred in expectancy but not in AOC anxiety or any value over the semester, and (3) expectancy was a great negative predictor for AOC anxiety in phase 1, while expectancy, intrinsic value and cost value were powerful predictors for the latter in phase 2. Based on these findings, some implications for teaching and learning AOC to bilingual students are discussed.

**Keywords:** academic oral communication, anxiety, expectancy-value beliefs, interaction, bilingual
