In the agricultural areas of Langqin Zhangbu and Maji Zhangbu valleys in northern foot of the western Himalayas, warped irrigated soils are a primary type of cultivated soils. Warped.irrigated soils in Tibet generally have three typical genetic horizons: 1) plough horizon with a thickness of 17 cm or so,an average organic matter content, of 3.24%, whieh is 2-10 time as much as that of original soil, higher fertility and higher contents of N, P and K; 2) old trrigated and cultivated horizon with a thickness of 50-80 cm, more carbon residues, few pieces of pottery and sheets of iron and an organic mater content of 0.8%-1.0%, being an important genetic horizon distinguished from other cultivated soil.sy and 3) original soil horizon with a burial depth of more than 1 m, being haplo-desert soil in ,Langqing Zhangbu Valley and being cryocalic scil in Majia Zhangbu Valley. In these proffiles of warped irrigated soils, there are neither depasition or surface accumulation CaCO₃ occurring in the original soils nor double mellow horizon.