In this paper, the design method for a dense fragment generator, based on the directed drive principle of cylindrical cased explosive with fragments at one end, was examined. The model parameters of three types of fragment generators with central angle of the liners being 10degrees, 20degrees and 30degrees respectively, were given. Both analytical and numerical methods were used to predict or simulate the performances of the fragment shower produced by the fragment generators. In the static tests of the fragment generator, a target mesh was used to determine the velocity distribution of the fragment shower. Through adjusting the target distance, the phenomenon and character of the target damage at different distances caused by a dense fragment shower was studied. The synergistic effect occurred in all six shots (two shots for each type) of the generator test, in which the target distances were 1 m to 6 m and the thickness of the steel target plate was 3 mm. Finally, cumulative effects and additive effects occurring in the tests were defined and a preliminary analysis was undertaken.