The invention discloses a dynamic measuring method based on dependable computing and a management system. The management system interacts with a user through a user management interface of an operation system and application programs. The management system comprises a dynamic measurement control module interacting with the operation system, wherein the dynamic measurement control module controls a judgment module, an audit module and a measuring module, the judgment module obtains a latest measurement result from the audit module and judges whether the operation system is dependable or not according to a strategy, the measuring module is responsible for detecting the dependable state of the operation system in operation, the audit module is responsible for calculating, storing and reporting measurement results in a classified mode, the control module is responsible for configuring external management programs to other modules, sending system state information to the external management programs and providing access ports of trusted software special hardware for the modules. The management system works in a kernel layer, the system can guarantee integrity of the modules once starting static measurement, and credibility and safety are improved.