Abstract：It is a hot issue to study the transport properties of rocks with low permeability(≤10－16 m2) in geological disposal of radioactive waste，underground gas and oil storage tanks and construction of deep cavern groups. Based on the developed low permeability test equipment，gas transport properties of typical Jinping marbles are studied under steady flow of nitrogen. Also numerical simulation of gas flow through marble is performed. Comparisons are made between pseudo pressure method and an exact method by considering Klinkenberg effect in gas transportation equation. Fitting results using the exact method show better agreement with laboratory testing results and the transport parameters gained are more convincible. Numerical study and test results both show that：(1) low permeability test equipment can be used to study transport properties of dense rocks under different temperatures and stress conditions；(2) it is necessary to consider Klinkenberg effect in the study of gas transport properties in dense rocks，and the results from numerical study considering Klinkenberg effects agree very well with laboratory test results；and (3) intrinsic permeability of Jinping marble is about 10－20 m2.
