C-labelled p

p’-DDE was used to study the behavior of p

p’-DDE in " Fluvio Marine Yellow Loamy soil" under upland and flooded conditions at Hangzhou

the subtropical area in China. The dissipation of p

p’-DDE in the soil under upland condition is faster than flooded condition. The half-life of p

p’-DDE residue in soil is 43 days for flooded condition

and only 25 days for upland. There is no big difference in the distribution pattern of p

p’-DDE for both conditions. Most of 14C-p

p’-DDE residue is concentrated within the layer of 0-2cm in soil. The p

p’-DDE is very stable in soil in both cases

and 14C-p

p’-DDE still take about 90% of the total 14C-activity in the methanol extractable residue even 43 weeks after tyeatment.