By set up of an equation of dynamic contact between hammer and foundation soil, in this paper a finite element model for dynamic compactionks impact and collision is constructed. Contact force and contact displacement of hammer is found in the calculation. By using UL method, a large deformation dynamic equilibrant equation of the finite element system of dynamic compaction is formulated in this paper. A geometric nonlinear influence taken into consideration in analysis. Erosion element is adopted in the program for decreasing the grid instability. The program considers the influence of the weight of hammer and can simulate the departing phenomenon between hammer and soil. At the end of this paper, some engineering examples are discussed to test and verify this program.
 孔令伟、袁建新:强夯的边界接触应力与沉降特性研究,岩土工程学报,1998,20(2):86~92. ong L inw eim,et al..St udy on ocntact and set tlem ent properties during dynamic consolidation.Chinese Journal of Geot echn ical Engineering,1998,20(2):86~92.
 Chen W-H,et Y eh J-T,T hree-dimensional finit e elementanalysis of static and dynamic problems w ith f rict ion,Comp.And.St ruct.,1990,35(5):541~552.
 Taylor R,et al,O n a finit e elem ent method for dynamic contact/impact problems.Int.J.Num.M eth.Engng.,1993,36:2123~2140,