Using 4-(2, 4, 6-trinitroanilino)benzoic acid (TABA) as the ligand, a noval lead complex, {[PbL₂(DMF)H₂O]·2(C₃H₇NO)H₂O}_n(1) (L=4-(2, 4, 6-trinitroanilino) benzoate, DMF=N, N′-dimethylformamide), was synthesized by a solvent evaporation method. Its structure was determined by a X-ray single crystal diffractometer. Its thermal decomposition process was determined by TG-DSC. DSC curves of the 50/50-complex 1 /RDX mixture at different heating rate were determined and the kinetic parameters of the thermal decomposition reaction of the mixture were calculated. Results show that the crystal is monoclinic, its space group is P2(1)/c with crystal parameters a=6.900(2)Å, b =19.162(6)Å, c=34.866(11)Å, β=94.261(4)°, V=4597(3)ų, Z=4. Pb(Ⅱ) ions are connected by 4-(2, 4, 6-trinitroanilino) benzoate and 1-D coordination polymer chains are formed. The thermal decomposition of complex 1 mainly undergoes four stages. The first stage occurs between 58 ℃ to 84 ℃ and complex 1 mainly loses its crystallized and coordinated water molecules and part of crystallized DMF molecules. The temperature range of 84 ℃ to 231 ℃ is the second thermal decomposition stage with complete loss of the rest DMF molecules.The energetic organic ligand TABA^2-decomposes mainly at stages 3 and 4 of the process and exothermal peaks appear at 296 ℃ and 335 ℃, respectively. The thermal decomposition of RDX was accelerated by complex 1.