Meandering delta sediments were widely developed in the Yanchang Formation of Upper Triassic in Ordos BasinThe main characteristics of meandering delta are as follows:Meandering delta is relatively far away from the source area，and is asedimentary system in which various facies are relatively complete，grown size of sediments is fine and textural and mineral maturity are relatively highMineral composition is similar to that of source areaVarious sediment structures are developed，including trough and planarcross bedding，parallel bedding，smalescale bedding，wavebedding and horizontal bedding，animal and plant fossils and relic structuresIn plain part,submarine distributary channels of meandering deltaic plain have complicated branches and crevasse history which are interrelated.Mouth bar is not well preservedMeandering delta of Ordos Basin was mainly formed during the rebound of lake basin depressionWe studied the division and contract of the Yanchang Formation oil-bearing bed，the characteristic facies association，geometryof the skeletal sand bodies and the palaeogeographic patternIt was concluded that the shallowwater platform delta was gradually transformed into terrestrialplainMeandering delta in this region have great potential for oil and gas reservoirs，and is a favorable facies zone in oil and gas exploration