TACAN System is near range military radio navigation system, Aim at the problem of Jump 、invalid and accuracy error of airborne TACAN ranging, the cause of problem is analysed, the operating principle of TACAN ranging is introduced. Fall together the integrated communication navigation and identification system, a plan of double antennas diversity receiving design and implementation for the integrated airborne TACAN ranging is raised. In the plan, the constitution of integrated airborne TACAN is introduced, the working process of double antennas diversity receiving is designed, the data selection strategy of double antennas diversity receiving is analysed, the strategy of decision-level data selection based on measurement results is raised and implemented, the optimum estimation with Kalman Filter is used in strategy, the optimum results is output by comparing prediction residual of the distance, solve limitations and problem of the handoff of antennas of airborne TACAN ranging, and it has been successfully utilized in engineering practice.