Abstract: The technical features and implement methods of dependable embedded computers were concluded and analyzed, of which the evolution was systemically described. The development process was depicted by four phases, the basic reliability, the system availability, the system integrity and the system dependability. Based on the trend of dependable technology, the dependable computer architecture was proposed with three dimensions, integrity level, fault-tolerant scope and redundancy scope, in order to emphasize the key technologies in the safety critical domain.