Sediment Core XFJ-l was collected from the Xinfengjiang Reservoir in Guangdong Province, and the samples after core-slicing were dated by the excess ²¹⁰Pb. Each sediment layer was analyzed for HCH and DDT by equipment of the GC-ECD. The re-cults show a time trend of HCH and DDT in the sediment core so that relationship between the source and transport pathway of thesecompounds can be discussed. Goncentration of HCHs and DDTs in Core XFJ-1 ranges from 1.26 to 3.90ng/g and from 1. 00 to 3.96ng/g, respectively.The concentration of HCHs and DDTs declined singe the early 1980's, indicating that measures of HCH-and DDT-ban have been effective. Vertical distribution characteristics of HCHs and DDTs show these compounds were not comefrom the. secondary source that was transported by runoff from the basin. The primary source was confirmed as the major source insediment core, and was input by air dust deposition. Vertical profile of y-HCH,o,p'-DDT and p,p'-DDT indicate that the com-pounds still have new input after the ban.