In order to realize the aim of precision airdrop, good turn performance is extremely important for parafoil system. Based on a typical parafoil system, a 6-DOF nonlinear model was established and its turn mechanism was analyzed. By numerical simulation, the influence of parafoil directional stability and drag rudder on parafoil turn performance was mainly studied. The conclusion can provide theoretical reference for the design of parafoil system.%翼伞系统要实现精确空投的目的，其良好的转弯性能极其重要。本文以典型翼伞系统为对象，深入分析了翼伞的转弯机制，并建立了翼伞系统六自由度非线性模型。通过仿真实验，重点研究了翼伞的航向安定性和阻力方向舵对翼伞系统转弯性能的影响，所得结论可为翼伞系统的设计提供一定的理论参考。
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