This article explores teachers' assessment knowledge and practice through a narrative inquiry of a college EFL teacher, Betty (pseudonym), in the People's Republic of China. Drawing on Crites' (1971) notions of sacred stories and secret stories in teachers' professional knowledge landscapes (Connelly & Clandinin, 1995), it examines Betty's account of her experience of assessment reform. This account comprises three stories involving her colleagues and students. Following Connelly and Clandinin's (2006) three strands of narrative inquiry, this article discusses three structural conditions of teacher knowledge, temporality , sociality , and place , and their effects on teachers' knowledge construction of assessment. We argue that teachers' prior assessment experience will affect their current practices and future plans for assessment (temporality); power relationships in teachers' workplace will greatly in uence their assessment decision-making (sociality); and the specifi c contexts in which assessment takes place will affect teachers' sense of security and therefore the effectiveness of the assessment (place). The fi ndings highlight the recognition of teachers' agency in assessment practice, the importance of negotiation with teachers of the reform policies, and the urgent need for professional development. 1 The CET is a large-scale standardized test administered nationwide by the National College English Testing Committee on the behalf of the Higher Education Department of the Ministry of Education in China. It is intended to measure the language profi ciency of non-English-major college students. 2 According to a survey conducted by Zhou (2005) among 1,200 EFL teachers in 49 different colleges, 56% of teachers hold a bachelor of arts degree, and 28% hold a master of arts degree. The bachelor's degree programs that prepare English teachers are mostly provided by English departments in teachers' colleges, where most of the teacher training focuses on practical teaching (Wu, 2002). According to Wang (2003), most of the master's degree programs of applied linguistics that prepare college EFL teachers in China generally provide one testing course, which has little to do with formative assessment.