In order to effectively control the divergence angle created by the prefabricated fragments of a warhead composite, ANSYS/LS-DYNA 3D nonlinear finite simulation was used to study the broken fragment field of the combined damage elements in view of the type, diameter, material and spacing of the pre-fragments. The determined structure was tested and verified. The results show that spherical fragments can be used to obtain uniform distribution of fragments inside and outside. The influence of fragment material, diameter and spacing on the divergence angle of combined warhead pre-fragment was also studied, and the basic structure of combined warhead was obtained. Tungsten alloy was selected as the spherical fragment with a diameter of 10 mm and a spacing of 1 mm between its inner and outer ring. The static detonation test was carried out for the designed combined warhead, and the test results were basically consistent with the simulations.