为了改善导引头整流罩形状对导引头内光学系统成像质量的影响，减小导弹总体飞行阻力，以优化整流罩形状为目的，对整流罩外曲线与内曲线进行了分析和优化。首先进行了计算流体力学(CFD)数值仿真与风动试验对比，得到准确的仿真参数；在此基础上，通过CFD数值仿真得到整流罩外曲线长径比与整流罩阻力系数的归一化关系函数，采用光程差的评价方法得到整流罩外曲线长径比与成像质量的归一化关系函数，在确定空气动力性能与成像质量权重后，得到优化后的整流罩外曲线，外曲线为R为37.5，C为-0.75的椭圆。在获得外曲线形状的基础上，以光线经过整流罩后偏折最小为优化目标，运用光线追迹方法，建立优化函数，最终得到优化的整流罩内曲线，内曲线为R为33.31，C为-0.78的椭圆。对整流罩内、外曲线方程的分析表明，这种优化的整流罩既有良好的空气动力学性能，也有良好的光学性能。

With the aim to reduce the effect of the figure of a dome on the imaging quality of optical system for a missile and to decrease the flying drags of the missile, the figure of the dome was investigated and the outside and inside figures of the dome were optimized. Firstly, the Calculated Fluid Dynamics(CFD) simulation and a wind tunnel experiment were compared to obtain the accuracy simulated parameters, and the normalized relation function between the ellipticity and the drag of dome was derived by the CFD simulation. Then, the Optical Path Difference(OPD) was used to evaluate the normalized relation of the optical performance and ellipticity, and the optimized outside figure could be obtained after determining the weights of the aerodynamic and imaging quality. The obtained outside figure is an elliptic with R=37.5 and C=-0.75. On the basis of the outside figure and by taking the minimum deviation of the light through the dome as an optimizing goal, the optimized function was established by using ray tracing method, and an optimized inside figure of the dome was also obtained. The inside figure is a conic with R=33.31 and C=-0.78. An analysis shows the optimized dome has excellent aerodynamics and good optical performances.