The phase diagrams of 2,4,6-trinitroluene (TNT)-polyester and TNT-picric acid (PA) are constructed by differential scanning calorimetry (DSC). Their eutectic temperatures are 49.5 and 61.5 degrees C, respectively. The compositions corresponding to the eutectic points are 44.4 and 68.4 wt.% of TNT respectively. The compatibility of TNT-polyester and TNT-PA systems has also been investigated. The experimental data indicate that the TNT-polyester system has poor compatibility above 240 degrees C, but the TNT-PA system has good compatibility both at ambient temperature and higher temperatures.