This paper deals with the distribution of amino acids and nitrogen in organo-mineral complex of periodically waterlogged paddy soils developed on red earth and waterlogged paddy soil developed on lacustriue deposits with various nitrogen levels in Zhejiang province.The results of experiments are summarized as follows:1.The nitrogen content in organo-miineral complex increased with increasing nitrogen content in soil samples.For different fractions of organo-mineral complex,the nitrogen contents were G₂>G₁>G₀.The percentage of alkali hydrolysable and pyrophosphate extractable hosphate extractable nitrogen in G₀ of waterlogged paddy soil was higher than that in G₂ or G₁,but for periodically waterlogged paddy soils,that in G₂ was higher than that in G₀ and G₁.