Abstract: During the Lugeon water pressure test in an oil reserve library project,hydraulic friction of the test tube was measured at the test site,and the permeability value of the test sections were calibrated.The results show that the overall permeability of the underground rock is not strong,especially at 50 m deeper down,generally less than 0.2 Lu.All the Lugeon values before having removed its hydraulic friction are less than the true value within the range of-1.21% ~-10.48%.Therefore it highlights