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The fact that borehole pressure is higher than formation pressure will lead to mud invasion��and resistivity logging cannot truly reflect the formation resistivity�� According to the basic mechanism of dual lateral resis- tivity log and gas- water two phase percolation equation and conduction equation�� this study carried on the simulation and got two- dimensional axisymmetric model of high salinity tight gas reservoir which is invaded by mud�� In this paper��the variation of water saturation��formation resistivity and electric field distribution of deep/shallow lateral wall over time were studied�� It found that water saturation increases and formation resistivity decreases as the time increases�� Mud invasion influences both deep laterolog and shallow laterolog response��which lead to resistivity difference of tight gas of deep laterolog and shallow laterolog is higher than that of conventional one��and the resistivity difference peak of tight gas appear earlier��