Military munitions explosives TNT (2,4.6-trinitrotoluene) and RDX (1,3,5-hexahydro-1,3,5-trinitrotriazine) have been widely used in the military operation and manufacture process. The contaminated soil and shallow groundwater by these explosive residues and their degradation products have raised many public health and environmental concerns. A growth chamber study was conducted to investigate the rhizodegradation of 14C-TNT and 14C-RDX and the relationship of degradation with soil enzyme activities in the rhizosphere of eight selected grass species. The plant species included: 1) switchgrass, 2) eastern gammagrass, 3) tall fescue, 4) orchardgrass, 5) smooth bromegrass, 6) perennial ryegrass, 7) Illinois bundle flower and 8) hoary tick-trefoil. All plant treatments were grown in pots containing Mexico silt loam. Pots containing soil without plants were used as controls. Forages were grown to maturity (~3 months), and the rhizosphere soils were collected. Radio labeled TNT or RDX was then applied to the rhizosphere soil and incubated in the dark for 100 days. The preliminary results suggested that rhizodegradation of TNT, RDX was significantly stimulated by selected grasses, particularly warm-season switchgrass and eastern gammagrass. The grass species showing high TNT and RDX rhizodegradation potential could be incorporated into remediation plan for sites contaminated with these munitions explosives residues.