Abstract: Supports which UCAV system providing include that mission planning and control station presents clear and unambiguous interface and directions for operators，and variable authorization task management strategy of agents on-board allocates tasks and functions between operators and UCAV.Those must be based on human interaction with automation and divided into many levels of decision aiding such as“at call”，“advice”and“veto”.An experiment is developed to test quantitatively the efficiency of those levels and disadvantages induced by systems mistake.At last conclude that the efficiency of those levels is equal，and reliability beyond 35% can be employed through compared response time and accuracy of manual and other three operation ways with aiding.The conclusion can direct the design of decision aiding system in UCAV.