20111949 Chen Keyang(Exploration and Development Research Institute,Daqing Oilfield Company Limited,Daqing 163712,China)Study on Perfectly Matched Layer Absorbing Boundary Condition(Geophysical Prospecting for Petroleum,ISSN1000-1441,CN32-1284/TE,49(5),2010,p.472-477,9 illus.,22 refs.)Key words:elastic waves,boundary conditions In order to improve the boundary absorbing efficient of manmade boundary,sine-cosine absorbing attenuation factor,