Abstract: Micro?seismic monitoring,as the most effective means of hydraulic fracturing monitoring,has attracted more and more atten?tion and is becoming a hot research topic due to its advantages such as easy engineering and full observation.Nevertheless,due to the particularity of microseism,the problem whether valid micro?seismic events could be received under the strongly noisy ground is the key point of the whole technique.In this paper,the author conducted an in?depth research in three aspects,i.e.,the energy conducted by the hydraulic fracturing,the interference situation of fracture truck unit noise and the difference of different depth of micro seismic propaga?tion and,from two angles of "signal ( effective events) and noise ( surface noise)",reached the conclusion that surface microseism is capable of receiving reliable fracture signal.The real micro?seismic data acquisition from Yan227 horizontal hydraulic fracturing well ver?ified the effectiveness of this technology,which provides the basis for the implementation of the surface microseismic technology.