A study on the behavior of p, p'-DDT in flooded soil was conducted from 1990 to 1991. ¹⁴C-p,p'-DDT was used as a tracer. TLC, ARG techniques were used. A chromatography scanner was used to determine the radioactivity in spots of TLC plates. The behavior of DDT in flooded soil is different from that in upland soil. The dissipation of DDT was faster, DDT and its metabolites moved down faster, and more radioactivity became to bound residue in flooded soil as compared with those in upland situation. In extracts, DDT, DDD, DDE, DDA and an unidentified product were detected and their amounts were changed with time. About 90 % of the DDT disappeared and DDD became the key component of extractable residue within 8 weeks in flooded soil, whereas DDT took about 80% of the methanol extractable residue in 43 rd week sample of upland soil.