摘要：To investigate the impact of dynamic assessment(DA)on the development of speaking skills,a case study was conducted,recruiting a non-English major *** was constructed following the design combining sandwich and cake format with an interactionist *** collect data,a profile was designed in accordance with the China’s Standards of English Language Ability(CSE)to record the learner’s changes.A semi-structured interview was conducted to reveal his perspectives on *** generated profile with specific mediator-learner’s moves revealed the learner’s microgenetic development in both organizational knowledge and oral expression strategy *** thematic analysis of the interview demonstrated the learner’s positive experience with DA,while also unveiling the weak points of ***,the operational framework for applying interactionist DA in the oral classroom was discussed,and the complementary relationship between DA and traditional teaching and testing practices was highlighted.