Abstract: It is known that, to protect successfully the objects, the final missing distance of the missile must be greater than its lethal radius. The principal factors affecting missing distance of the missile are the instantaneous miss distance in distinguishable time and error correction after the missile can tell the objects apart. For noncoherent dual-source jamming, the range of two-plane distance and its optimized solution is considered to improve the effect of jamming. By analysis of the final missing distance expression, the relationship between missing distance and two-plane distance can be obtained and then the range and optimal distance of two-plane are realized. The results indicate that the principal factors affecting two-plane optimal distance are the power ratio of two jammers, the relative velocity between the missile and objects, and the line-of-sight angle at the moment when the missile tells the objects apart.