Abstract: This paper introduces the use of some new imported techniques such as supercritical fluid chromatography and its combined technique, liquid chromatography combined technique, Fourier transform infrared spectrometry and its combined technique in the separation and identification of 12 the chemical composition and structure of fossil fuel.These techniqucs are especially suitable for analyzing macromolecule polar compounds and polycyclic aromatic compounds. In these analysis functions of these new techniques are not replaceable.