The work pattern of V / UHF air ground tactical data link mostly is of fixed time apportion. So there exists a contradiction between user capacity and information update velocity. Increasing user capacity could make the information update velocity slow, and expediting information update velocity could cause the user capacity to decline. Aiming at this problem, and considering the demand of new generation air ground tactical data link, after analyzing the transmit requests of air - state information and direct -induct information, a kind of V / UHF air ground tactical data transmit scheme based on FDM - TDM is proposed. The analysis and experiments prove that by adopting this scheme the user capacity will increase 5 times more, and simultaneously the information update velocity is still kept speedy.