Thermal analysis is one of the standard test methods cited by pharmacopoeia of various countries. DSC can be used to test the melting point, glass transition and polycrystalline transformation of small organic molecules, obtain the phase diagram, calculate the purity and study the compatibility of excipients. Information such as drug thermal stability, storage stability, moisture absorption/drying, solvent volatilization can be obtained using TG. Combined with the thermodynamic software, decomposition kinetics can be studied, storage stability and shelf life of drugs and food can be predicted, and a reasonable storage temperature can be set.