A series of novel blend films of deacetylated konjac glucomannan (d-KGM) and Chitosan hydrochloride (CHI center dot HCl) were prepared successfully by using the solvent-casting technique with different blending ratios of the two polymers. The miscibility and aggregation structure of the blend films were studied by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction and scanning electron microscopy. The results indicated that the blend system of d-KGM and CHI center dot HCl had a conditional miscibility. A new crystal occurred and hydrogen-bonding interaction was strengthened when the CHI center dot HCl content in the blend films was 40%. The effects of deacetylation degree of KGM, acids (the solvent Chitosan dissolved in), temperature, and the mix ratio on the swelling behavior of the blend films were also studied. The blend film KC3 (CHI center dot HCl content in the blend films was 30%) had not only the highest equilibrium swelling degree (26 times) but also the highest tensile strength, and it could be regarded as a potential absorbent film material. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 115: 1503-1509, 2010