ABSTRACT
In recent years, junior high school teachers in different subjects have paid more and more attention to Problem-Based Learning (PBL), and they want to implement the concept into their teaching and design their teaching using the PBL model. This research looks at how to effectively design and implement curriculum and instruction in the middle school classroom. This paper sorts out and analyzes the previous general theories and classroom cases to clarify the theoretical basis and main problems faced by this research. Combined with the implementation of some actual cases in the junior high school classroom, the difficulties in the implementation process of the papers. For example: difficulties faced in teamwork, lack of interest in the classroom, etc are reflected and some strategies and insights to solve the difficulties are put forward in combination with the characteristics of the classroom, which helps the implementer to clarify the difficulties that should be considered in the implementation process, improve the level of the implementation of the curriculum, and also help the designers to collect the necessary feedback to revise the original curriculum and teaching design.
