Frequent　irrigation　activities　have　triggered　numerous　landslide　hazards　along　the　margins　of　the　loess　platform.　For　a　better　understanding　of　the　process　of　irrigation　water　penetrating　through　stratified　loess　sediments,　a　full-scale　field　infiltration　experiment　with　a　diameter　of　20　m　is　conducted　on　the　South　Jingyang　tableland,　Shaanxi　Province,　China.　The　amount　of　irrigation　water,　volumetric　water　content,　matric　suction　and　pore-air　pressure　are　monitored　to　reveal　the　infiltration　process　of　loess　sediments.　The　monitoring　results　can　be　drawn　as　follows:　(1)　The　propagation　of　wetting　front　is　more　than　11　m　under　the　ponding　condition.　The　infiltration　rate　is　initially　high,　then　decreases　gradually　and　finally　approaches　a　constant　value　less　than　the　saturated　hydraulic　conductivity　of　the　soil　in　shallow　depth.　(2)　The　vertical　fractures　parallelling　to　the　edge　of　the　tableland　in　Malan　loess　are　revealed　through　vertical　shaft,　which　has　an　aperture　of　less　than　15　mm.　The　preferential　flow　is　observed　in　the　preferential　path　of　the　Malan　loess　layer.　(3)　The　first　paleosol　layer　(S1)　is　proved　to　be　permeable,　and　a　transient　perched　water　with　a　waterhead　less　than　44　cm　is　developed　above　the　lower　part　of　S1.　(4)　The　pore-air　in　soil　is　compressed,　and　an　air　entrapment　ahead　of　wetting　front　is　observed　during　wetting　period.　The　maximum　pore-air　pressure　measured　in　loess　sediments　varies　from　1.1　kPa　to　4.3　kPa.　©　2022,　Editorial　Office　of　Chinese　Journal　of　Geotechnical　Engineering.　All　right　reserved.