To determine the charge parameters of combustion pots in various conditions,VLW EOS method is used to calculate co-volume and impetus of ignition charges and explosive charges. The calculated results together with Nobel-Abel EOS,are used to predict charge parameters of combustion pots for attaining some maximum pressure output. Experiments with 1 cm³ combustion pot indicate that the average maximum pressure output of combustion pots with 0.2 g B/KNO₃ (ignition charge) and 0.0995 g RDX (combustion charge) is 179 MPa,and that of combustion pots with 0.2 g B/KNO₃ and 0.199 g RDX is 348 MPa,respectively close to 192 MPa and 384 MPa which are design values by VLW EOS method.