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2-D Greens functions of a porous medium are widely applied in soil dynamics,where the porous medium is short for a two-phase saturated porous medium [1].As many issues mentioned in geo-technology,they can be used or simplified to a plane strain problem[2,3].In history,in 1958 De Hoop proposed that 2-D Greens function can be obtained by the integration of 3-D Greens functions with respect to the x3-axis(z-axis)in(-∞,+∞)Firstly[4]; but Chen J.used dimensionless parameters to solve the 2-D Greens functions of the solid phase and the fluid phase of a porous medium in 1994[5].