“双新”背景下，随着新课改理念的提出以及新教材的颁布，对历史学科教学提出更高要求。如何培养学生历史学科核心素养，落实立德树人的学科目标成为历史教学一大核心。近年来，学界对基于问题的教学模式（PBL模式）与不同学科教学之间的融合进行了探索。其中单元教学是一大研究方向，单元教学更加强调知识的整体性，其与强调问题引导、学生主导的PBL模式的结合更有利于培养学生的问题意识、促进学生的深度学习。基于此，本篇论文对PBL下高中历史大单元教学进行探究，论述二者结合带来的教学价值并通过具体单元案例来论述其在实际教学中的应用策略。

Under the background of "double new", with the idea of new curriculum reform and the promultion of new textbooks, higher requirements are put forward for the teaching of history. How to cultivate students` core quality of history and how to implement the subject goal of cultivating virtues and cultivating people has become a core of history teaching. In recent years, the academic community has explored the integration between problem-based learning (PBL) and teaching in different disciplines. Unit teaching is one of the major research directions. Unit teaching lays more emphasis on the integrity of knowledge. The combination of unit teaching and student-led PBL, which emphasizes problem guidance, is more conducive to cultivating students` problem awareness and promoting students` deep learning. Based on this, the paper explores the large unit teaching of high school history under PBL, discusses the teaching value brought by the combination of them, and discusses its application strategies in practical teaching through specific unit cases.