SaaS is the abbreviation of Software-as-a-Service. It is a mode of providing software through the Internet. Manufacturers deploy application software on their own servers. Customers can order the required products from the manufacturers through the Internet according to their actual needs. For application software services, manufacturers are paid according to the number of services ordered and the length of time, and the services provided by the manufacturers are obtained through the Internet. Users no longer need to buy software, but instead rent web-based software from the provider to manage business activities without the need to maintain the software. The service provider has full authority to manage and maintain the software. The software manufacturer provides Internet applications to customers at the same time , It also provides offline operation of the software and local data storage, so that users can use the software and services ordered by it anytime and anywhere. For many small and medium-sized enterprises, SaaS is the best way to adopt advanced technology, because it eliminates the need for enterprises to purchase, build and maintain infrastructure and applications, reduce production costs, and effectively improve efficiency