Potential allelochemicals in rhizosphere soil under green prickleyash are identified by gas chromotagraph-mass spectrometer (GC-MS). 23 and 29 compounds are determined respectively from the topsoil and deep-seated soil samples. The compounds mainly include hydrocarbon, alcohol, ester, benzene, hydroxybenzene and amine, most of which are reported as allelochemicals. The results show that there are allelochemicals in rhizosphere-soil of green prickleyash.