DDTs concentrations in surface water and sediment were measured from August 2007 to March 2008 in the mainstream of Haihe River. The results showed that DDTs concentrations ranged from 6.88-78.82 ng/L (mean 28.54 ng/L) in surface water, 5.82-45.5 ng/g (mean 21.55 ng/g) in sediment. The dominant DDTs form in surface water and sediment was found to be p, p'-DDT and p, p'-DDE, respectively. A steady state fugacity model (sediment-water exchange model) was established and successfully applied to the field data for p, p'-DDT in Haihe River. The parameter sensitivity analysis showed that sediment-water exchange of p, p'-DDT was mainly influenced by biodegradation rate constant, suspended particle-water partition coefficient and particle settling flux.