The figure of the dome have influents not only on the optical system

but also on the missile’s drag which can influent the field of fire. The dome’s figure is composed by inside figure and outside figure. In this paper

the CFD simulation is used to get the relation function between ellipticity and drag of the dome. To get the relation function of optical performance and ellipticity

we use OPD function as a tool to evaluate it. After deciding the weights of the aerodynamic and optical performance

here gets the final dome’s outside figure which is a elliptic with ellipticity equals to 2. As this is a foundation

and the minimum deviation of the light through dome as the optimizing goal

by using ray tracing method

the optimizing function is built up. After calculation

the inside figure of the dome is conic with R=33.31 c=-0.78.