Abstract: The Differential thermal analysis-Thermogravimetry-Microcomputer system is equipped with a programmed temperature controller and also a microcomputer data processing unit. Over ten dedicated application software are provided. The system has the function of CRT display for sampled data and required results can also be printed and plotted. Though the sample taken for examination and test is only a few milligrams, its enthalpy change, activation energy and glass transient temperature etc. can be measured.The system has found applications in pharmaceutical detection, formulation seiving, catalyst appreciation, purity determination as well as explosive stability appreciation.