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The photocatalytic degradation of N,N-dimethylacetamide (DMAC) on the condition of photocatalytic oxidation with the energy/volume ratio of 10 W/0.5 1 has been investigated in aqueous solutions containing TiO2 suspensions as photocatalysts.Focusing on the behavior of photocatalytic degradation of DMAC,the optimal separated conditions of the intermediate products were investigated with the high performance liquid chromatography (HPLC) using mixed eluent (0.4％ CH3COOH:CH3OH =92 ∶ 8 by volume).Meanwhile,the main intermediate products were identified with the liquid chromatography mass-spectrometry (LC/MS).Based on the structure identification of the organic intermediates,generation and changes of the main intermediates in photocatalytic degradation processes were interpreted and then a possible pathway of degradation of DMAC was proposed.Furthermore,the mineralization degradation of DMAC was illustrated and identified as the final existence of the morphology of N (turning into NO3-) in the strong ion exchange column by the multi-dimensional chromatography.