The molar enthalpies of dissolution for 2-(dinitromethylene)-5-methyl-1,3-diazacyclopentane(DNMDZ) in dimethyl sulfoxide(DMSO) and N-methyl pyrrolidone(NMP) were measured using an RD496-2000 Calvet microcalorimeter at 298.15 K under atmospheric pressure.Empirical formulae for the calculation of the molar enthalpies of dissolution(ΔdissH) were obtained from the experimental data of the dissolution processes of DNMDZ in DMSO or NMP.The relationships between the rate constant(k) and the molality(b) and between the reaction order(n) and the molality(b) were determined.The corresponding kinetic equations describing the two dissolution processes were dα/dt=10-2.16(1-α)1.01 for the dissolution of DNMDZ in DMSO,and dα/dt=10-2.02(1-α)0.85 for the dissolution of DNMDZ in NMP,respectively.