“Natural language processing technology has been widely applied in the field of education. Essay writing serves as a crucial method for evaluating students’ language skills and logical thinking abilities. Rhetoric, an essential component of essay, is also a key reference for assessing writing quality. In the era of large language models (LLMs), applying LLMs to the tasks of automatic classification and extraction of rhetorical devices is of significant importance. In this paper, we fine-tune LLMs with specific instructions to adapt them for the tasks of recognizing and extracting rhetorical devices in essays. To further enhance the performance of LLMs, we experimented with multi-task fine-tuning and expanded the training dataset through synthetic data. Additionally, we explored a model ensemble approach based on label re-inference. Our method achieved a score of 66.29 in Task 6 of the CCL 2024 Eval, Chinese Essay Rhetoric Recognition and Understanding(CERRU), securing the first position.”