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Gas stability is one of the important factors influencing the performance of thermal ananlysis instrument’s baseline,and besides that,switching gas channel smothly is also a fundmental condition for professional thermal analysis testing.But currently mostly home-produced instruments with manual controlling system which had short precision,and operated inconvniently.In order to improve inteligentlized level and precision of the gas controlling system, a specilized gas control module applyied for thermal analysis instruments was designed. The module used STM32F107VC 32bit MCU as the control core, through rational design of hardware and data processing software evidently promotes precision,response time and stability.The module has already won national patent and applied for DSC30 thermal analysis instruments. 