With the specially designed large-scale oedometer,routine rheological tests and dry-wet cycle tests have been conducted on specimens to investigate the rheological and dry-wet cycle characteristics of rockfills,which have been widely used in the high-fill foundations of mountain airport.The test results demonstrate that the long term deformation due to dry-wet cycle grows more evidently than the routine rheological deformation,which increases rapidly during early immersion,and gradually flattens after draining the water.There is approximately a logarithmic relationship between dry-wet cycle deformation and cycle numbers.In addition,a simplified coupling calculation method that can meanwhile compute the rheological deformation and dry-wet cycle deformation is proposed,by which the settlement of foundation after construction in X airport of Yunnan Province is computed according to local rainfall law.