Abstract: As is well known, experimental teaching is crucial for cultivating studentsʼ practical and innovative abilities. How to overcome the spatial and temporal limitations of classroom teaching and ensure the open utilization of experimental resources is an important task for all the experimental teaching centers in Chinese universities. This article takes the National Experimental Teaching Demonstration Center for Chemistry (Beijing Normal University) as an example to introduce the multi-level and multidimensional laboratory access strategies. The center incorporates the well-organized “second classroom activities” into the experimental teaching system for supporting undergraduates to actively participate various innovation and entrepreneurship activities, academic competitions, scientific research, and science popularization. These initiatives provide students with diverse, self-driven, and innovative-focused practical training opportunities, effectively strengthening the role of experimental teaching centers in cultivating innovative talents and serving as the demonstration base for basic education. These efforts have proven to be effective and have significant educational outcomes, making them worthy of wider adoption.

Key words: Second classroom, Experimental competition, Laboratory open-access mode, Reform of experimental teaching mode