Abstract: It is quite difficult to achieve the maneuvering target tracking in clutter environment due to the uncertain measurement source and target flight status. The tracking accuracy of the maneuvering target is usually affected by various factors including the target flight status and clutter. Stronger maneuvering of the target or the excessive clutter interference may result in the loss of tracking and the low tracking accuracy. Tracking gate can determine whether the measurement trace comes from the target's decision threshold, and provides an effective tool for practical applications. When the target is maneuvering, the target may be lost if the tracking gate is not adjusted in time. An appropriate setting of tracking gate can reduce erroneous data associations and improve tracking accuracy. On the contrary, inappropriate tracking gate may result in the loss of follow-up or mis-following. Aiming at the above shortcomings, this paper proposes a flight status sensitive tracking gate adjustment algorithm (FSSTGAA) under the framework of IMM-PDA method. Although the traditional tracking gate design taking the error information as the trigger condition can effectively reduce the target loss rate, it cannot ensure the tracking accuracy. By analyzing the source and changing trend of the error rate according to the target flight status, the proposed FSSTGAA will dynamically adjust the tracking gate according to the error dynamic change rate when the tracking error is within the acceptable range. Finally, it is shown from simulation results that, compared with the traditional tracking gate adjustment algorithms, the proposed algorithm can effectively reduce the target loss rate and improve the tracking accuracy of maneuvering targets.