The interception trajectory of land-based missile should be designed for anti-satellite interception. Mathematical models for calculating the powered phase trajectory and predicting unpowered phase trajectory were established. A universal variable algorithm to predict unpowered phase trajectory was put forward. And a method to optimize interception trajectory was also put forward. A kind of missile was selected to simulate. The simulation results showed that if the flight time was reasonably designed, the designed trajectory can satisfy the requirements of space interception.%地基反卫星拦截需要设计拦截弹道。建立拦截弹道主动段弹道计算模型和被动段轨道预测模型，提出被动段普适变量轨道预测算法，给出拦截弹道优化方法。采用一种导弹进行仿真计算，结果表明，只要被动段飞行时间设计合理，所设计弹道能满足空间作战要求。
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