Abstract: This paper outlines the analytic principle of Model ECK-1 Automatic Permeability Analyser,the design of gas flow program,the calibration of capillary flow rate,the plotting for the curves of pressure and flow,the operation procedure and the correlation of testing analysis.According to the correlation of many experimental data,it is indicated that the samples with the error of duplication is less than 5% account for 95% of the total samples using such a equipment.The accuracy for the testings could reach±1.5% and the deviation for three repeated testings is no more than 4% on the same sample.For 82 rocks with their permeability ranging from 40 to 7000×10³μm²,96.3% of them have their error less than 5%.