In this study, sugar-acid mixed solution was prepared with the reference of acids content and sugar content and their relative ratio in market yellow rice. Firstly, acids content was used as the interference factor to investigate the effects of acids on sugar NIR spectra by two-dimensional infrared spectroscopy. The results suggested that, with the increase of acids content, the infrared absorption peaks at 1800~1850 nm range presented certain change successively, O-H and C-O groups of acids reacted with O-...