Based on the analysis of the use of online education platforms in Guangzhou in 2020，the application of “Guangzhou TV Class” and the connection between online and offline teaching，the authors find that online education platforms represented by Public Platform for Smart Education of Guangzhou have played an important role in supporting the teaching work in Guangzhou. But at the same time，it also exposes some problems，such as the construction of network infrastructure needs to be strengthened，the low practicality of stock high-quality digital education resources，the relative lack of high-quality digital education resources，Guangzhou TV Class needs to be further popularized and applied，and the integration of online and offline education needs to be optimized and upgraded. Guangzhou should carry out the construction of “new infrastructure” of Educational Informatization，optimize the supply service of high-quality educational digital resources，deeply carry out the research and promotion of hybrid learning mode，and further improve the information literacy of teachers and students，so as to further improve the application level of online education in primary and secondary schools in Guangzhou.