The specific heat capacity (C_p) values of four energetic compounds, 3－nitro－1,2,4－triazol－5－one (NTO), carbohydrazide(CHZ), 2,4－dinitrophenol (DNP) and picric acid (PA), were determined by differential scanning calorimeter (DSC). The least square method is applied to treat experimental data. In the range of 340-410 K, the C_p versus T relationship of NTO and CHZ can be expressed as a simple equation: C_P=a+bT. In the range of 330-360K, the C_p versus T relationship of DNP and PA can be expressed as a cubic equation: C_p=a+bT+cT²+dT³. The R－Squares(COD) of measured results of NTO, CHZ, DNP and PA, are 0.9591,0.9730,0.9968 and 0.9972, respectively.