A method of computing/determining the Arrhenius/non-Arrhenius kinetic parameters of the exothermic decomposition reaction of energetic materials (EMs) was presented from initial temperature (T_e), peak temperature (T_p), conversion degree (α_{ei or pi}) at T_{ei or pi} and data (β_i、T_α,i, i=1, 2, …, L) corresponding to isoconversation degree (α_i) for DSC curves under different constant heating rate (β) conditions. The Arrhenius/non-Arrhenius kinetic parameters of the exothermic decomposition reaction of sodium cis-bis(3-(5-nitro-1, 2, 4-triazolate tetrahydrate) [Na₂(BNT)(H₂O)₄] were obtained by this method. The critical temperature of thermal explosion (T_b) of [Na₂(BNT)(H₂O)₄] was calculated by the non-Arrhenius kinetic parameters obtained and compared with the value of T_b obtained by Arrhenius kinetic parameters. The validity and reliability of non-Arrhenius kinetic parameters of [Na₂(BNT)(H₂O)₄] obtained in this work were verified.