The Trust Development Policy of Critical System

The trust of the critical systems is very important, for the corruption of these software can result in uncountable losses. This paper describes the policy of high-reliability critical system development, including its´ attributes, means and impairments. The idea, employing with redundant diverse modules to reduce the risk of failure, works very well in other many fields. According to the idea, we propose using the redundant modules to detect the error existed in the software system and warn the users. It´s useful to improve the trust of software and ensure the stability of critical system.