The thermal decomposition processes of 2-H-heptafluoropropane were investigated during a 30 second reaction time and at temperatures of 400, 500, 600, 700 and 800 degrees C using fast pyrolysis method and Fourier transform infrared spectra (FTIR) and gas chromatography/mass spectrometry (GC/MS) analytical techniques. The results indicate that the reaction temperatures have the obvious effects on the thermal decomposition of 2-H-heptafluoropropane. The 2-H-heptafluoropropane is steady at first three temperatures, whereas starts to obviously decompose at 700 degrees C and undergoes intense decomposition at 800 degrees C. At the same time, coke formation was observed on the surface of the reactor at 800 degrees C. Moreover, three cyclocompounds, 1,2-bis(trifluoromethyl) perfluoroindane, perfluoro(1-ethylideneindane) and octafluoronaphthalene, were for the first time discovered in the products of thermal decomposition at 800 degrees C. This demonstrates that 2-H-heptafluoropropane experiences not only simple decomposition, but also cyclization and the polymerization reactions under high temperature thermal decomposition conditions.