Keywords: 
• Double Three System /
• environmental biology /
• experiment teaching /
• innovation

Abstract: Nanjing University has developed, in recent years, a new set of undergraduate teaching methodologies known as the "Double Three System". It is designed to encompass three phases (Department Cultivating Stage, Program Cultivating Stage and Diversified Cultivating Stage) and three distinctive development paths (Academic path, Interdisciplinary path and Employment & Entrepreneurship path). In order to fulfill the goal of this teaching reform, the teaching innovation team of Environmental Biology at Nanjing University is actively working to build the platform and outline the experimental steps with special focus on the innovative experimental teaching modules. The aim of the program is to train the students' ability of conducting experiments and scientific research independently. With the integration of three modes of the experiment—“ the basic module, the comprehensive module and the innovative module”, the program will arouse the students' interests and encourage their proactive engagement with the program. It is also helpful to build a good experimental teaching environment. The results show that the “double three system” experimental teaching reform has been successful in cultivating students’ spirit of exploration and has improved the students' ability of innovation. The reform program has explored the different ways of cultivating high-quality talents in the field of environmental biology.