Abstract
The Internet plus intelligent technology online teaching has become an important development direction of higher education in the world since the period of COVID-19 and it will continue in the post-epidemic period for its compensations for the deficiencies of traditional classroom teaching. Based on the internet plus intelligent technology such as the teaching platform Tencent Classroom and Apps such as QQ or Wechat, the exploration and practice of online and offline mixed teaching mode was carried by taking the phytogeography teaching as an example. This paper put forward the measures of the three aspects of building high-quality network resources, designing classroom teaching content and optimizing evaluation system to implement the online and offline mixed teaching mode of plant geography. It showed a good overall teaching and learning effect by using teaching platform for online teaching and QQ group or wechat group as assisting communication and interaction for online or offline learning. The results could provide some references for the application of the online and offline mixed teaching mode in phytogeography teaching.