Dynamic tests to warhead can provide more exact data for weapon system evaluation than static tests.The choice of beam-width in the test has direct effect on the choice of test point.Based on analysis, modeling, and simulation to movement of warhead dynamic fragments, the dispersion of the fragments was studied.Meanwhile, by using radar in the warhead dynamic test, the characteristics of the fragments, such as quantity, velocity and distance distribution in radar beam-width, were analyzed, with focus on the influence of radar beam-width to radar characteristics of warhead fragments.The result is helpful for the development of warhead tests.