A series of gas permeability and saturated penetration tests on Malan loess are accomplished by using the improved ZC-2015 air permeameter and TST-55 permeameter. We obtain two permeability parameters of gas permeability ka and saturation permeability coefficient Kw respectively. The void ratio e is acquired by laboratory normal experiment. And the planar void ratio e0 is obtained from electron microscopy(SEM)which is analyzed by image-pro plus(IPP). Then combining with the test results and using mathematical model, the relationship between macroscopic and microcosmic pore parameters and infiltration parameters are established. The results show that dry density of remolded soils increases, the number of particles per unit volume increases, porosity area decreases. The buried depth of undisturbed dry loess samples increases. Soil pore area and pore number, the average pore diameter of macropores and mesopores in loess significantly decrease. The semi-logarithmic linear model can eliminate the magnitude difference between Kw, ka and the pore structure parameters, and the fitting results is better. lgKw and lgka with e, e0 show a good linear relationships. When the water content changes, the regulation of slope and intercept about the gas permeability fit lines change obviously. Due to uniform sample preparation, fitting curves of remolded soils show the high fitting degree. Comparing with the remolded loess, fitting degree of undisturbed loess in different depth is low because of structural difference of deposition process.