Tatical data link system is an information system combining communications, navigation and identification, intended to exchange surveillance and command and control (C²) information among various C² platforms and weapons platforms to carry out varied missions of each service. Tatical data link terminals operate in the 960～1215 MHz band, which is reserved on a worldwide basis for the safe operation of aeronautical radionavigation equipment. The tatical data link system must be planned carefully before the operation. However several restrictions or limitations must be placed on operations. The typical constraints among different platforms are discussed in this paper. Then the tatical data link planning problems are modeled. Finally a greedy algorithm is described.