Detailed analysis and research on the characteristics of Chaheji river catchment distributary channel sand body and its effect on development are carried out. According to statistics of sand bodies by drilling,the subaqueous distributary channel sand body of Chaheji oilfield has small vertical thickness and narrow width. The thickness of single sand body distributes between 1-5 meters,and the river width is generally less than 100 meters. Sand body and oil sand body can be added by infill drilling,and connectivity of sand body and oil sand body is also increased. However,even well spacing reduces to 100 meters,the degree of control pattern to the sand body is still low. Most of the oil sand bodies are difficult to form the injection production relation,appearing the phenomena like production and no injection or injection and no production. The injection-production relationships of oil sand body mainly are two point and three point of injection production system. It is difficult to form a perfect injection-production well pattern system. The multiple direction effect relationship between oil wells and water wells is illusion,mainly due to the development of composite layer. Affected by the sand body characteristics,the types of remaining oil include mainly lenticular oil sand body with no control of the existing well pattern,remaining oil of production with no injection by elastic development,remaining oil by one-way water flooding etc.