Due to the challenges of all-round development, higher-education students are increasingly demanding more flexible learning that goes beyond the on-campus/online dichotomy. However, university students miss learning opportunities because of the conflict of time and space. Blended learning is an effective way to create more learning opportunities and support university students' flexible learning, but its implementation varies across contexts. This study proposed an alternative blended teaching and learning approach to solve practical problems defined in the context of a traditional classroom in a university in Hong Kong when students pursue flexible learning and global learning. A three-round action research approach was used to improve the effects of blended synchronous teaching and learning. Data collection and analysis in each round showed that the students positively rated the implementation of blended learning according to their needs, the quality of the technologies adopted, and the benefits gained. This blended synchronous teaching and learning mode was structured based on the implementation of different actions in three rounds, bridging the gap between research and practice in blended synchronous learning.