In order to make precise parafoil airdrop system with minimal drop height safely through complex wind field, the paper presents an algorithm to calculate optimal trajectory.The paper converted path planning into a Bezier curve problem with limited feature points parameter optimization problems;according to general characteristics of wind environment feasible trajectory analysis, given the optimization strategy;using improved particle swarm optimization algorithm for the optimal solution. Experimental results show that the proposed algorithm can provide a optimal track in complex wind field, satisfing all constraints. The algorithm proved a reasonable design and easy to implement the project.%针对当前翼伞空投航迹规划中未考虑复杂风场影响，文中提出一种利用风场优势求解最优航迹的算法。将航迹规划问题转换成Bezier曲线的参数寻优问题，针对风场环境下可行轨迹特点提出优化策略，提出改进的粒子群优化算法求取最优解。实验结果表明，该航迹规划算法能在复杂风场环境下求出一条满足各种要求的最优航迹，算法设计合理，工程易实现。
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