<p>During the preparation process of 3,4-bis (4-nitrofurazan-3-yl) furoxan (DNTF), once the oxidizing capacity of the reaction system weakens, it leads to incomplete conversion of the raw material 3,4-bis (4-aminofurazan-3-yl) furoxan (DATF), consequently forming a DATF-DNTF mixed system. The thermal decomposition behavior of DNTF in the presence of DATF was studied using thermal analysis techniques, and the results indicate that DATF can significantly reduce the onset decomposition temperature, peak temperature and activation energy of the DNTF. Furthermore, the decomposition processes exhibited autocatalytic characteristics in the presence of DATF. Besides, we conducted further research on the thermal decomposition kinetics of DATF-DNTF mixed system, and the whole decomposition process conforms a three-step continuous reaction model, with the first two steps are autocatalytic reaction characteristics, while the last step is an n-order reaction model. The thermal decomposition kinetic parameters were obtained through model fitting, and the reliability of the kinetic model was validated by comparing the activation energy trends derived from the simulated and experimental data. Furthermore, the thermal hazard parameters such as self-accelerating decomposition temperature (<i>SADT</i>) and adiabatic induction periods (<i>tm</i>r_ad) were predicted under different scenarios, and the thermal explosion and runaway would be occurred at a lower temperature; it is necessary to ensure complete conversion of DATF and prevent the formation of DATF-DNTF mixed system.</p>