Mission maintainability assessment of complex system based on state evaluation

Based on the foundation of mission successfulness, we put forward the concept of mission maintainability assessment. Analyzing the general process of mission maintainability assessment of complex system and studying the basic method of mission maintainability assessment. Based on the state evaluation of related functional unit, we put forward the thoughts that parallel part as a whole which contain repairable function units and by solving repairable function units mission probability of success for the maintainability assessment. Finally, the application of the example shows that the method is effective and practical.