Since 2020, the rampant of COVID-19 has made it impossible for the universities to carry out traditional offline teaching, so the universities have developed online teaching practice under the leadership of the Communist Party of China. However, engineering design courses have their own characteristics, which makes online teaching unable to meet the requirements of the course. So we take the urban design course as an example, analyze it’s mission and purpose, consider that online teaching has the following problems, such as the difficulty of site investigation, the difficulty in deepening online teaching (the loss of space information expression, the failure of online communication between teachers and students), and the error in online oral defense. Accordingly, we carry out the systematic reform and innovation by the way of online site investigation（online site selection, online site investigation）, online educational reform (the use of "VR" technology, Optimization of online communication), and online oral defense correction. All of this will provide useful experience for the future integration of online and offline teaching and the deepening of online teaching reform.