Abstract: In this paper the composition and structure of the microscopic organic matter in coal (desmocollinite)are analyzed using the novel laser micropyrolysis gas chromatography-mass spectrometry system (LMPY-GC-MS). The LMPY-GC-MS system is character-ized by economical,fast-speed,accurate and no pretreatment and separation of samples,so it has a good future in science and technology.