The third Chinese total diet study to estimate dietary intake of contaminants was carried out in 2000. The levels of HCH and DDT residues were less significant in most of foodstuffs, but the level of HCH residues of aquatic foods in South 2 and in North 1 is respectively 75.99microg/kg and 170.72microg/kg, and the ratio of gamma-HCH is 90% of the total HCHs residues. To identify the contamination source of gamma-HCH, the individual province composite samples and the individual samples of aquatic foods from individual province were further analyzed. The level of gamma-HCH in bream (Megalobrama amblycephala) sample in Hubei province is 546.4microg/kg, which is 98.3% of all HCHs (exceeding the 0.1mg/kg HCHs EMRL in fish), the level of gamma-HCH in carp (Cyprinus carpio Linnaeus) sample in Heilongjiang province is 602.4microg/kg, which is 98.5% of all HCHs. The two samples polluted by Lindane were confirmed by GC-MS. The result suggests that Lindane has been used irregularly in some areas in China.