It is necessary to build a mathematical model about dynamic scattering section of warhead fragments which fits in with complex encounter condition between missile and airplane, in the designing phase of missiles. According to the corresponding relation "Static state→Dynamic state 1→Dynamic state 2" between the dynamic scattering section and static scattering section of warhead fragments, and the encounter parameter between missile and airplane target, a method for calculating the dynamic scattering speed and density of the warhead fragments is studied by searching the keys according to the way of "Dynamic state2→Dynamic state 1→Static state" with computer. The multi-value problem of warhead fragments dynamic scattering section is lucubrated, and a new method of multi-value solution of dynamic scattering section of warhead fragments is advanced, which fits in with complex conditions such as big static state scattering angle range of fragments, the fragments static state scattering direction slope forward or back. A new opinion about multi-value problem that the maximum amount of keys is four is educed. The correctness of the new opinion is verified through simulation examples.