Abstract: Samples which have been contaminated by improper packing may mislead the analytical results into false conclution.This kind of contamination was reported in foreign literature too.Obviously this problem remains prevailing and serious. Testing experiments on various packing materials indicated that adsorption is the main cause for contamination.Different packing materials have different comtamination effects on the same sample,while the same packing material also has different contamination effects on different samples.Such kind of contamination has changed the property, structure and composition of soluble organic matter in samples. For the sake of preventing samples from contamination and obtaining reliable analytical results,various kinds of packing material and dealing method are suggested.