Cloud classroom password should be composed of three combinations: uppercase English, lowercase English and numbers. The so-called cloud classroom is an internet service for the education and training industry. Users use the remote training system based on cloud computing technology to break through the time and space constraints, realize high-quality network teaching in different places, and be compatible with multi-terminal access such as PC, mobile phone and tablet. Whether it is cloud classroom or online education, it is a brand-new education model born on the shoulder of the giant Internet. This new educational model has brought more opportunities to educational institutions and more learning methods to students. Online education is extremely convenient for both educational institutions and students. Technically? Cloud classroom? It is an efficient, convenient and real-time interactive distance teaching classroom form based on cloud computing technology. The main performance of cloud classroom in schools is that cloud classroom manufacturers like Ruijie build a new generation of computer classrooms that are more conducive to teachers' teaching and students' learning. Compared with the traditional computer classroom, the school's cloud classroom has the characteristics of easy management, easy operation, strong function, low cost and more energy saving.