For the change of battlefield situation and other reasons, the unmanned aircraft Vehicles (UAV) in formation flight need flight delay in target attack. In the equal-altitude flying mode, the delay path planning method is presented based on hierarchical planning. First, this paper selects the best delay movement area based on the minimum risk value, and then adopts the delay path planning method to form the delay maneuver path satisfying the delay time and the requirement of flight constraints. Through analyzing and calculating risk of each track segment near the value, the UAV maneuver flight delay safe zone is determined and by using an analytical method the planning algorithm hover delay path is proposed based on the delay, delay time and the flight track constraints requirements. This algorithm is utilized to generate the time delay path satisfying the requirement of arrival time delay. The simulation results show that the hover delay path planning algorithm can accurately track the delay needed planning, plan a total time within the stipulated time, and meet the flight time delay requirement of UAV.