A trajectory forecasting algorithm of the reentry hypersonic glide vehicle is designed based on the linear growth character of the lift-drag ratio of the vehicle.Firstly,by judging the movement equation,the most important thing of the algorithm is discovered,which is that how to predict the lift-drag ratio.Secondly,the simulation of the target trajectory shows the linear growth rule of the lift-drag ratio,the model of the lift-drag ratio variation function is given and the trajectory forecasting algorithm is designed.Simulation results show the efficiency of the forecasting algorithm.This algorithm is important to study the problems on combating with the hypersonic glide vehicle.%针对高超声速滑翔飞行器再入拉起后升阻比呈近线性增长的特点，提出一种基于升阻比变化规律的轨迹预测算法。首先对目标运动方程进行分析，发现轨迹预测算法的关键在于能否预测升阻比的大小；然后通过对目标进攻轨迹的仿真得到了升阻比呈近线性增长的规律，给出了升阻比变化函数的形式及拟合方式，并在此基础上设计了轨迹预测算法，最后通过仿真验证了算法的有效性。该算法对反助推－滑翔无动力跳跃飞行器指挥决策问题的研究具有重要意义。
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