The interaction of ammonium dinitramide (ADN) and mixture of nitroglycerin and nitrocellulose (NC+NG) systems under the higher temperature was investigated by NBK LAWA gasometric measuring system. Results show that compared with the sum of maximum standard volume of evolved gas from systems ADN and (NC+NG), maximum standard volume of evolved gas from the ADN/(NC+NG) mixture (626.8 mL·g^-1) decreases, but the decomposition rate increases evidently, and the activation energy decreases to 82.58 kJ·mol^-1, which shows that there is a strong interaction between ADN and (NC+NG).