采用水溶液共混法制备共混物，研究了聚氧化乙烯与聚乙烯醇共混体系的相容性及共混体系中各组分的结晶性。实验结果表明，ＰＥＯ／ＰＶＡ共混物为不相容共混体系。ＰＶＡ分子间易于形成氢键是此共混体系不相容的主要原因。ＰＥＯ／ＰＶＡ共混体系为相分离结构，ＰＥＯ及ＰＶＡ皆可在各自的相区内形成结晶。体系中ＰＶＡ的存在不影响ＰＥＯ的结晶能力。共混体系在组成为５０／５０左右其力学性能有急剧变化，提示在此时发生了相倒转。 The blends were prepared by aqueous solution blending method. The compatibility of poly (ethylene oxide) / polyvinyl alcohol (PVA) blend system and the crystallinity of each component in the blend system were studied. The experimental results show that PEO / PVA blends are incompatible blend systems. The easy formation of hydrogen bonds between PVA molecules is the main reason for the incompatible blends. PEO / PVA blend phase separation structure, PEO and PVA can be formed in their respective phase region crystallization. The presence of PVA in the system does not affect the crystallization ability of PEO. Blending system in the composition of about 50/50 its mechanical properties have drastic changes, suggesting that phase inversion occurred at this time.