During some of the aircraft components assembly process, the flexible positioning tooling unit (tooling unit) is composed of a parallel mechanism. The pose of the aircraft component is determined by poses of the moving platforms of the tooling units. The differences between current rod lengths and object rod lengths of a unit can be calculated in real time by the current pose of the moving platform. These differences can direct the tooling unit to be adjusted to the object pose quickly, therefore the aircraft component arrives the object pose. A method was presented to obtain the real time pose of mobile platform of the tooling unit by using laser tracker and its STS six dimensional sensor (6D-Device). The working principles of tooling unit and 6D-Device were researched. The pose of 6D-Device was obtained by software interface, the pose matrix of the 6D-Device and the moving platform were derived by the pose. Experiment scheme was designed and the correctness of the algorithm was verified by experiments.