Software authorization system and method based on online dynamic authorization

The invention relates to a software authorization system and method based on online dynamic authorization. The system comprises multiple client terminal devices, an application server and a database. Each client terminal device comprises a session management interface module, a data interaction interface module and a log-in module. The application server comprises a session management module, a data interaction module, a web portal product managing module, a module which manages renting of a web portal as needed, an online dynamic authorization managing module and an authorization information registering module. According to the technical scheme, a method combining with hardware is adopted, so that a user can order a software product as needed in a renting mode by combining with authorization, set by an operation system, of the user. The software product is authorized in an online dynamic authorization manner and the user can add new function items, concurrence users and carry out renewal to prolong a term of